This article describes an issue that occurs after you install an antivirus software in Windows 8.1 or Windows RT 8.1. An update is available to fix this issue. Before you install this update, see the Prerequisites section.

Symptoms

On a computer that has an antivirus software installed, the following information is logged frequently in Event Viewer:


How to get 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 a Recommended update on Windows Update. For more information on 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 Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

Note The update for Windows RT 8.1 can be got only from Windows Update.

For more information about how to download Microsoft support files, select 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 install this update, install April 2014, update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) in Windows 8.1.

Registry information

To apply this update, you don't 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 doesn't replace a previously released update.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology that Microsoft uses to describe software updates.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.

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 0.16 xxx

    Windows RT 8.1

    RTM

    GDR

    6.3.960 0.17 xxx

    Windows 8.1

    RTM

    GDR

    6.3.960 0.18 xxx

    Windows RT 8.1 and Windows 8.1

    RTM

    GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed in the "Additional file information" 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.

Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Wscapi.dll

6.3.9600.18189

140,000

06-Jan-2016

23:56

Not applicable

Wscenter.mof

Not applicable

5,552

21-Aug-2013

23:38

Not applicable

Wscisvif.dll

6.3.9600.16384

20,480

22-Aug-2013

03:04

Not applicable

Wscproxystub.dll

6.3.9600.16384

11,264

22-Aug-2013

03:07

Not applicable

Wscsvc.dll

6.3.9600.18189

94,720

06-Jan-2016

16:30

Not applicable

x86 Windows 8.1

File name

File version

File size

Date

Time

Platform

Wscapi.dll

6.3.9600.18189

148,752

06-Jan-2016

23:46

x86

Wscenter.mof

Not applicable

5,552

21-Aug-2013

23:46

Not applicable

Wscisvif.dll

6.3.9600.17415

20,992

29-Oct-2014

01:52

x86

Wscproxystub.dll

6.3.9600.17415

11,264

29-Oct-2014

01:56

x86

Wscsvc.dll

6.3.9600.18189

104,960

06-Jan-2016

16:38

x86

x64 Windows 8.1

File name

File version

File size

Date

Time

Platform

Wscapi.dll

6.3.9600.18189

177,712

06-Jan-2016

23:45

x64

Wscenter.mof

Not applicable

5,552

22-Aug-2013

06:51

Not applicable

Wscisvif.dll

6.3.9600.17415

25,088

29-Oct-2014

02:35

x64

Wscproxystub.dll

6.3.9600.17415

14,848

29-Oct-2014

02:40

x64

Wscsvc.dll

6.3.9600.18189

146,944

06-Jan-2016

16:47

x64

Wscapi.dll

6.3.9600.18189

148,752

06-Jan-2016

23:46

x86

Wscenter.mof

Not applicable

5,552

21-Aug-2013

23:46

Not applicable

Wscisvif.dll

6.3.9600.17415

20,992

29-Oct-2014

01:52

x86

Wscproxystub.dll

6.3.9600.17415

11,264

29-Oct-2014

01:56

x86


Windows RT 8.1

File property

Value

File name

Arm_8e91900862edbf06674538f7b57471da_31bf3856ad364e35_6.3.9600.18189_none_258439121c51195a.manifest

File version

Not applicable

File size

707

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

Arm_microsoft-windows-securitycenter-core_31bf3856ad364e35_6.3.9600.18189_none_aee764a7cdab41ec.manifest

File version

Not applicable

File size

24,754

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,593

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

x86 Windows 8.1

File property

Value

File name

Update.mum

File version

Not applicable

File size

1,593

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

X86_1f7f087ae9e0613d87147d93dce4de6e_31bf3856ad364e35_6.3.9600.18189_none_8343c9d44af9b572.manifest

File version

Not applicable

File size

707

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

X86_microsoft-windows-securitycenter-core_31bf3856ad364e35_6.3.9600.18189_none_aee4f24fcdae2326.manifest

File version

Not applicable

File size

24,754

Date (UTC)

07-Jan-2016

Time (UTC)

00:15

Platform

Not applicable

x64 Windows 8.1

File property

Value

File name

Amd64_272b273bdea3c06ad6a384f290d0515c_31bf3856ad364e35_6.3.9600.18189_none_797c81e8136695bd.manifest

File version

Not applicable

File size

711

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

Amd64_3e7ee81398bb891809f126826072abfa_31bf3856ad364e35_6.3.9600.18189_none_08e46c5e866f7235.manifest

File version

Not applicable

File size

711

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

Amd64_microsoft-windows-securitycenter-core_31bf3856ad364e35_6.3.9600.18189_none_0b038dd3860b945c.manifest

File version

Not applicable

File size

24,758

Date (UTC)

07-Jan-2016

Time (UTC)

00:19

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,829

Date (UTC)

07-Jan-2016

Time (UTC)

00:12

Platform

Not applicable

File name

Wow64_microsoft-windows-securitycenter-core_31bf3856ad364e35_6.3.9600.18189_none_15583825ba6c5657.manifest

File version

Not applicable

File size

22,167

Date (UTC)

07-Jan-2016

Time (UTC)

00:19

Platform

Not applicable


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