To fix the problem when you only have a restore CD you'll have to search for a folder on your hard drive (or on the restore CD) that's named "i386" (without the quotes). Once you find that, copy it to your hard drive at the root (C:\i386). Make sure that the directory is located at the root of your C: drive (C:\i386) - if not, then you'll need to change the path to the proper entry in the registry edit.
Then perform this registry edit to point SFC.EXE at it:
So, the first step is to backup your registry. The easy way to do this is to set a System Restore point ( http://www.microsoft.com/windowsxp/using/h...temrestore.mspx
Next, go to Start...Run...and type in "regedit.exe" (without the quotes) and press enter. You'll see a folder-like view on the left, and entries on the right.
Navigate down the folder view on the left to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Setup Just click on the + sign to expand the view of the next level - so, to start, you'll click on the + next to HKEY_LOCAL_MACHINE and look for the SOFTWARE entry.
Then you'll click on the + next to SOFTWARE and look for Microsoft, and so on (through the Windows and CurrentVersion keys) until you get to the Setup key. Then just click once on the Setup key.
Look in the right hand pane and double click on the entry that says "SourcePath".
In the box that pops up, type in "C:\" (without the quotes) and press Enter. Then close regedit and reboot your computer. SFC.EXE /SCANNOW should now run without problems for you.
If you're unable to find the i386 folder, it may be that it's on a hidden partition on your hard drive or that the restore CD has been created in a different way and you can't view the directories.
If so, there's a couple of more things to try (please post your question in the forums) or you can look to see if your system has a repair or a non-destructive recovery option. This option will leave your programs and data intact while replacing all of the Windows files. This is also the next step if SFC.EXE /SCANNOW doesn't fix the problem.