Can't run SFC?

[Kenny]

XP Pro/SP2 and slipstreamed XP/SP2 CD.
Trying to run "sfc /scannow" get the message that it's the wrong disc for
the XP version installed or that the disc may be damaged.
Can't get out of this Retry/Information/Cancel unless I restart PC, even
Ctrl+Alt+Delete and trying to close from Task Manager doesn't let me
This is the disc used to install XP. No obvious marks on it but have
cleaned it anyway.
Have two optical drives and have tried it in both.
Have I got a damaged disc although it looks OK?
Would any of the post SP2 updates be causing this?
Advice appreciated.

 

[housetrained]

my computer - right click 'c' - properties - tools - check now and tick file
correction.

 

[Kenny]

That's only to run checkdisk, not SFC.
Posting to windowsxp.general group led me to this:
http://www.compphix.com/windowsfileprotection.html
which sorted it and also pointed me to the root cause which was that I had
changed the drive letters for my optical drives and SFC was looking in the
wrong place.

--

Kenny

my computer - right click 'c' - properties - tools - check now and tick
file correction.