As youve probably noticed when i learn something new i like to share it with the AO community. Well here is another.
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SYSTEM FILE CHECKER (2000/XP)
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The system file checker will scan your computer's important system files and will replace the ones that are damaged, hacked, or ones that are beyond repair with the real, official Microsoft versions.
C:\>sfc

Microsoft(R) Windows 2000 Windows File Checker Version 5.00
(C) 1999 Microsoft Corp. All rights reserved

Scans all protected system files and replaces incorrect versions with correct Microsoft versions.

SFC [/SCANNOW] [/SCANONCE] [/SCANBOOT] [/CANCEL] [/ENABLE] [/PURGECACHE] [/CACHE
SIZE=x] [/QUIET]

/SCANNOW--------Scans all protected system files immediately.
/SCANONCE ------Scans all protected system files once at the next boot.
/SCANBOOT------ Scans all protected system files at every boot.
/CANCEL ----------Cancels all pending scans of protected system files.
/QUIET-------------Replaces all incorrect file versions without prompting the user.

/ENABLE-----------Enables Windows File Protection for normal operation
/PURGECACHE----Purges the file cache and scans all protected system files immediately.
/CACHESIZE=x---Sets the file cache size
This command can be very helpfull when you have a virus that has totally messed up your system. Just boot in safe mode and type "SFC /scannow" in command prompt. Its a very good thing to know.
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Also the Recover Command is a good one to know.
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RECOVER(2000/XP)
Allows you to recover readable information from a damaged disk.

C:\>recover
RECOVER [drive:][path]filename

MORE COMMANDS AT (http://www.networkclue.com/os/Window...ands/index.php)