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SFC /Scannow Error

When you install Windows from a CD that has had a Service Pack streamlined into the installation files, when you run Windows File Protection's DOS commands, such as "sfc /scannow" it requests the original CD. Fine...

You insert the CD used to setup Windows but instead of accepting that disk, it repeatedly requests that you "Insert your Windows XP Professional Service Pack 2" CD.

In my case, the solution was to change the value in the "SourcePath" key in my registry.

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup\SourcePath It showed "D:" which is the drive letter that was in effect for my primary CD-ROM drive during install.

However, since install I have changed the drive letter for several devices, including said CD-ROM drive. Once I changed "D:" to "H:", SFC /SCANNOW worked fine.

Apparently, SFC/WFP looks at the registry to see if the SourcePath matches, instead of actually LOOKING at the CD's contents to verify validity.