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All the PCL inbox printer drivers become unsigned after you install the Microsoft .NET Framework 3.5 Service Pack 1Article ID: 961118 - View products that this article applies to. On This PageSYMPTOMSOn a Windows XP-based or Windows Server 2003-based computer, after you install the Microsoft .NET Framework 3.5 Service Pack 1, all the Printer Control Language (PCL) inbox printer drivers become unsigned. Note The .NET Framework 3.5 SP1 includes the Microsoft XML Paper Specification Essentials Pack that contains an updated Unidrv.dll file. This problem causes several issues. For example, Windows Management Instrumentation (WMI) may be unable to install a printer driver. CAUSEThis issue occurs because the Unidrv.dll file is unsigned. Therefore, all PCL inbox printer drivers become unsigned after the installation of this file. RESOLUTIONAn update is available to resolve this problem. This update releases a digital signature for the Unidrv.dll file.
The following files are available for download from the Microsoft Download Center: Update for Windows XP, x86-based versions Collapse this image 
(http://www.microsoft.com/downloads/details.aspx?FamilyID=d8bb1a0a-6a75-4d78-b349-0d5c5b468d1f)
Update for Windows XP, x64-based versions Collapse this image
(http://www.microsoft.com/downloads/details.aspx?FamilyID=d5c8a66b-26b8-4768-be12-2f1873f0c7aa)
Update for Windows Server 2003, x86-based versions Collapse this image
(http://www.microsoft.com/downloads/details.aspx?FamilyID=037fa2a0-313d-4f18-8ce0-d2538b38e06b)
Update for Windows Server 2003, x64-based versions Collapse this image
(http://www.microsoft.com/downloads/details.aspx?FamilyID=01f3975b-fa69-475f-8942-d25431f50ab6)
Release Date: February 8, 2009 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
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.
(http://support.microsoft.com/kb/119591/
)
How to obtain Microsoft support files from online services
PrerequisitesTo apply this update, the computer must run one of the following operating systems:
Restart requirementYou have to restart the computer after you apply this update.Hotfix replacement informationThis update does not replace any other previously released hotfixes.File informationThe English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.Windows XP, x86-based versionCollapse this table
Windows Server 2003, x86-based versionCollapse this table
Windows Server 2003 and Windows XP, x64-based versionCollapse this table
STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. MORE INFORMATIONDrivers that are included with an operating system or service pack release are known as inbox drivers. Inbox drivers are drivers that are released with catalog files. Drivers that are trusted by the catalog are known as signed drivers. Drivers that are released without the catalog file are known as unsigned drivers. For more information, click the following article number to view the article in the Microsoft Knowledge Base: 824684
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
PropertiesArticle ID: 961118 - Last Review: October 8, 2011 - Revision: 2.0 APPLIES TO
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