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ITsVISTA KB-Link: KB958909

It may take a long time to log on to a Windows Vista-based computer that has antivirus software installed, and you may notice that the file size of the Setupapi.app.log file is very large

You have antivirus software installed on a Windows Vista-based computer. When you start the system, it may take a long time to log on to the computer. If you examine the Setupapi.app.log file in the %SystemRoot%Inf folder, you may notice that the file size is very large. Additionally, the size of the Setupapi.app.log file continues to grow every time that you start the computer.

Note: Any log file of 5 megabytes or more is considered large in this article. Additionally, there are several Setupapi related log files in this article.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB958909.

Fix It
Microsoft has a way to automatically fix this problem, click the "Fix It" image to go to the Knowledge Base page that contains the download.

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