Regarding SFC; It's one of Windows' "hidden utilities" - Can't recall if it's installed by default, or even if it's in every version. Click on Start, then Run, then type in the sfc followed by the enter key. If it doesn't run from that, you might need to search the Windows distribution CD for it, or perhaps your version of Windows doesn't include it. It's function in XP has changed, but I used to run it weekly in Win98. It scans all the system files & notifies you of any that have changed since the last time it ran, giving you the chance to restore any changed from the original cab files, or any backups you've made (every 3 months, when windows was behabing itself, I backed up all the critical system files, Dlls, Etc. into a ZZZ-BkUp folder under Windows, so I could easily fix any problems caused by incompetantly designed applications or utilities I'd recently installed (surprising how many programs are written to overwrite critical system files, even when the system files are months newer that the version being installed). It also offers to restore any single file you specify, extracting it from the original CAB files. I once did a search for any *.exe files in the Windows folders, researching all of them that had the same datestamp as windows itself, & installing all I found on the Win-CD. I found 14-18 that had no actual icons or controls in Windows itself. Most had associated help files, & all could be called from the run menu. I created a folder in my start menu & put shortcut to all of them there. Labeled it "Hidden WinUtilities". most of them were pretty specialized, but SFC, MSConfig, and 2 or 3 others I found to be very useful for maintaining control over what was going on in my computer. Good Luck