Article ID: 832323
If you have Microsoft Windows XP Service Pack 1a (SP1a) installed on your computer, and you perform an in-place upgrade or a reinstallation (also known as a repair installation) of Windows XP SP1a, you may experience one or more of the following:
These problems may occur if Windows XP SP1a or Windows Update updates the Winsta.dll file and the repair installation does not restore the Winsta.dll file correctly. These problems may also occur if a virus scanning program interferes with the installation of a service pack.
To resolve these problems, follow these steps:
To obtain Windows XP SP1a, visit the following Microsoft Web site:
http://www.microsoft.com/downloads/details.aspx?FamilyID=0136e5f8-1684-4202-b2d0-c6a43430f12a&displaylang=enFor additional information about how to obtain the latest Windows XP service pack, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322389/ )How to Obtain the Latest Windows XP Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
For additional information about how to perform an in-place upgrade (reinstallation) of Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/978788/EN-US/ )How to Perform an In-Place Upgrade (Reinstallation) of Windows XP