SFC comes with Windows. It's a DOS program, you have to click on the start menu, click on :Run, and then type sfc /scannow into the run box. SFC is supposed to check the core windows files and report/replace any that are missing/out-of-date/corrupt. Just how SFC decides that a file is good or in need of replacement is unclear, since Windows Update keeps replacing files with updated versions. Just how SFC keeps up with this is unclear/unknown to me, but I think it works, somehow.
When SFC finds a file that it wants to replace, it will ask you to put your Windows install CD into the CD drive. However, many of us don't have a Windows install CD. We bought new computers that didn't come with Windows CD's.
But there is a fix. Computers without Windows CD's have a hard disk partition, (D: usually) that has all the stuff the Windows install CD has on it. I just burned it into a CD, left the CD in the drive, and then SFC ran to completion. I had to do a little trimming. The D: hard drive had too much stuff to fit onto a 600 MByte CD. I only put the "I386" stuff on the CD, and I even had to trim that a little bit to make it fit.
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