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I accidentally deleted WUDFHost.exe and several associated files beginning with WUDF, due to having misread info about the files. I thought that they were spyware.

What should I do? I thought there was a way to check my windows system files against an online database? Something I can type into the run box?

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up vote 3 down vote accepted

You can use the SFC /scannow command from a command prompt (elevated Command Prompt in Vista/7/8) to check critical files against backups Windows made

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@Moab That is exactly what I was looking for. –  Wolfpack'08 Oct 20 '12 at 21:58
    
However, there's a switch to make this against an online database as opposed to vs a cd? –  Wolfpack'08 Oct 20 '12 at 21:59
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Unfortunately no, this is the bad part of SFC in XP, which was corrected in Vista and later, it is best to use a XP cd with sp3, then do a reboot and manual windows update after SFC has completed. –  Moab Oct 20 '12 at 22:17
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