This article describes a microcode update for Intel Central Processing Units (CPUs). The update is for Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7 Service Pack 1 (SP1), or Windows Server 2008 R2 SP1. Before you install this update, see the Prerequisites section.
About this update
This update fixes several issues with Intel CPUs that could cause computer crashes or functions incorrectly. Also, this update improves the reliability of computers that uses certain Intel CPUs.
How to obtain this update
Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.
Method 1: Windows Update
This update is provided as an Important update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.
Method 2: Microsoft Download Center
The following files are available for download from the Microsoft Download Center:
| Operating system | Update |
|---|---|
| All supported x86-based versions of Windows 8.1 |
Download the package now. |
| All supported x64-based versions of Windows 8.1 |
Download the package now. |
| All supported x64-based versions of Windows Server 2012 R2 |
Download the package now. |
| All supported x86-based versions of Windows 8 |
Download the package now. |
| All supported x64-based versions of Windows 8 |
Download the package now. |
| All supported x64-based versions of Windows Server 2012 |
Download the package now. |
| All supported x86-based versions of Windows 7 |
Download the package now. |
| All supported x64-based versions of Windows 7 |
Download the package now. |
| All supported x64-based versions of Windows Server 2008 R2 |
Download the package now. |
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Update detail information
Prerequisites
To apply this update, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1 or Windows Server 2012 R2. Or, install Service Pack 1 for Windows 7 or Windows Server 2008 R2.
Registry information
To apply this update, you do not have to make any changes to the registry.
Restart requirement
You may have to restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.
File information
The global version of this update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 8.1 and Windows Server 2012 R2 file information and notes
The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch 6.3.960 0.17xxx Windows 8.1 and Windows Server 2012 R2 RTM GDR The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8.1 and for Windows Server 2012 R2" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 8.1
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mcupdate_genuineintel.dll | 6.3.9600.17826 | 554,328 | 12-May-2015 | 00:32 | x86 |
For all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Hvax64.exe | 6.3.9600.17826 | 1,380,184 | 12-May-2015 | 00:24 | x64 |
| Hvix64.exe | 6.3.9600.17826 | 1,423,192 | 12-May-2015 | 00:24 | x64 |
| Hvloader.efi | 6.3.9600.17826 | 1,390,936 | 12-May-2015 | 00:24 | Not applicable |
| Hvloader.exe | 6.3.9600.17826 | 1,264,472 | 12-May-2015 | 00:24 | x64 |
| Hvservice.sys | 6.3.9600.17826 | 68,952 | 12-May-2015 | 00:24 | x64 |
| Kdhvcom.dll | 6.3.9600.17826 | 19,800 | 12-May-2015 | 00:24 | x64 |
| Mcupdate_genuineintel.dll | 6.3.9600.17826 | 536,920 | 12-May-2015 | 00:24 | x64 |
Windows 8 and Windows Server 2012 file information and notes
The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch 6.2.920 0.17xxx Windows 8 and Windows Server 2012 RTM GDR The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8 and for Windows Server 2012" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 8
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mcupdate_genuineintel.dll | 6.2.9200.17368 | 753,496 | 11-May-2015 | 21:00 | x86 |
For all supported x64-based versions of Windows 8 or Windows Server 2012
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mcupdate_genuineintel.dll | 6.2.9200.17368 | 527,704 | 11-May-2015 | 22:49 | x64 |
Windows 7 and Windows Server 2008 R2 file information and notes
The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version Product Milestone Service branch 6.1.760 1.18xxx Windows 7 or Windows Server 2008 R2 SP1 GDR The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mcupdate_genuineintel.dll | 6.1.7601.18848 | 715,200 | 09-May-2015 | 18:09 | x86 |
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Mcupdate_genuineintel.dll | 6.1.7601.18848 | 493,504 | 09-May-2015 | 18:26 | x64 |
Additional file information
Additional file information for Windows 8.1 and for Windows Server 2012 R2
Additional files for all supported x86-based versions of Windows 8.1
| File property | Value |
|---|---|
| File name | X86_dddc54458b2c51722765181ed72197fb_31bf3856ad364e35_6.3.9600.17826_none_9e43152854b8a191.manifest |
| File version | Not applicable |
| File size | 717 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 00:41 |
| Platform | Not applicable |
| File name | X86_microsoft-windows-m..update-genuineintel_31bf3856ad364e35_6.3.9600.17826_none_51a2a3bacdb479ee.manifest |
| File version | Not applicable |
| File size | 2,572 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 00:44 |
| Platform | Not applicable |
Additional files for all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2
| File property | Value |
|---|---|
| File name | Amd64_757e6ef79545caccaced19b0eb5f7c6c_31bf3856ad364e35_6.3.9600.17826_none_6220debb8f4f3858.manifest |
| File version | Not applicable |
| File size | 710 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 00:41 |
| Platform | Not applicable |
| File name | Amd64_cbecde2bd81bc8506d5e9897540f9955_31bf3856ad364e35_6.3.9600.17826_none_6a92a6364577a6ec.manifest |
| File version | Not applicable |
| File size | 721 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 00:41 |
| Platform | Not applicable |
| File name | Amd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.3.9600.17826_none_2152863e3949e497.manifest |
| File version | Not applicable |
| File size | 6,493 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 00:41 |
| Platform | Not applicable |
| File name | Amd64_microsoft-windows-m..update-genuineintel_31bf3856ad364e35_6.3.9600.17826_none_adc13f3e8611eb24.manifest |
| File version | Not applicable |
| File size | 2,574 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 00:41 |
| Platform | Not applicable |
Additional file information for Windows 8 and for Windows Server 2012
Additional files for all supported x86-based versions of Windows 8
| File property | Value |
|---|---|
| File name | X86_8e7326cc6f925e54a0d84c990aa074fe_31bf3856ad364e35_6.2.9200.17368_none_cabfaf3ba05425a8.manifest |
| File version | Not applicable |
| File size | 717 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 07:23 |
| Platform | Not applicable |
| File name | X86_microsoft-windows-m..update-genuineintel_31bf3856ad364e35_6.2.9200.17368_none_b984a27a83a05a20.manifest |
| File version | Not applicable |
| File size | 2,569 |
| Date (UTC) | 11-May-2015 |
| Time (UTC) | 21:03 |
| Platform | Not applicable |
Additional files for all supported x64-based versions of Windows 8 and of Windows Server 2012
| File property | Value |
|---|---|
| File name | Amd64_569274d89bfda5557b2fbb9005926f6d_31bf3856ad364e35_6.2.9200.17368_none_cc8f46c7d42a3931.manifest |
| File version | Not applicable |
| File size | 721 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 07:23 |
| Platform | Not applicable |
| File name | Amd64_microsoft-windows-m..update-genuineintel_31bf3856ad364e35_6.2.9200.17368_none_15a33dfe3bfdcb56.manifest |
| File version | Not applicable |
| File size | 2,571 |
| Date (UTC) | 11-May-2015 |
| Time (UTC) | 22:56 |
| Platform | Not applicable |
Additional file information for Windows 7 and for Windows Server 2008 R2
Additional files for all supported x86-based versions of Windows 7
| File property | Value |
|---|---|
| File name | X86_597b63a1349efdcd3b182e935833f222_31bf3856ad364e35_6.1.7601.18848_none_8b96a5ce9bc2c173.manifest |
| File version | Not applicable |
| File size | 717 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 14:27 |
| Platform | Not applicable |
| File name | X86_microsoft-windows-m..update-genuineintel_31bf3856ad364e35_6.1.7601.18848_none_beaaf69b10a43194.manifest |
| File version | Not applicable |
| File size | 2,530 |
| Date (UTC) | 09-May-2015 |
| Time (UTC) | 18:32 |
| Platform | Not applicable |
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
| File property | Value |
|---|---|
| File name | Amd64_468c651ebe49ae50f4785ab7ae06d724_31bf3856ad364e35_6.1.7601.18848_none_7bf245856a1fa19b.manifest |
| File version | Not applicable |
| File size | 721 |
| Date (UTC) | 12-May-2015 |
| Time (UTC) | 14:27 |
| Platform | Not applicable |
| File name | Amd64_microsoft-windows-m..update-genuineintel_31bf3856ad364e35_6.1.7601.18848_none_1ac9921ec901a2ca.manifest |
| File version | Not applicable |
| File size | 2,532 |
| Date (UTC) | 09-May-2015 |
| Time (UTC) | 18:49 |
| Platform | Not applicable |
References
Learn about the terminology that Microsoft uses to describe software updates.
Third-party information disclaimer
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.