SFC /SCANNOW (space between C and /), is System File Check. It checks
for missing and/or corrupt system files and replaces them. There is no other
command for the Home Edition.
Disk Cleanup tool hangs on Windows XP
http://www.jsiinc.com/SUBO/tip7200/rh7213.htm
SFC - System File Checker - (SFC /Scannow)
/SCANNOW
Scans all protected system files immediately.
/SCANONCE
Scans all protected system files at the next boot.
/SCANBOOT
Scans all protected system files at every boot.
/REVERT
Windows XP: Return to default settings.
Tip: SFC sets the following registry value:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Winlogon\SFCScan
Tip: SFC Creates a log - Start/Run/Msinfo32/Tools/File Signature
Verification Ulitity
