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"sfc /scannow" retry menu issue -- why does hitting RETRY eventually work?

I see there are many posts here and elsewhere in which people put in their windows CD, and run SFC /SCANNOW, but the process keeps repeating a menu which asks you to insert the windows CD and hit Retry, More Info, or Cancel.

I tried one of the solutions at the very bottom here...
...which was simply to keep hitting "retry" over and over.  And it worked.  As the poster wrote, when you keep hitting retry, the progress bar eventually starts to move, either a little or a lot, until you have to use another series of "retries".  But you'll get to the end eventually.

What I want to know is -- what's going on here? Is the "sfc /scannow" process just "giving up" on a file, or eventaully skipping a file, and moving on?  Or is the optical disc data just barely being read -- sometines correctly, other times not?

This whole thing doesn't make a lot of sense to me...

thx for any info
4 Solutions
I run sfc from a command prompt . .

Click on Start . . Run . . type "cmd" ( without "'s ) . . then type sfc /scannow

It will usually ask you to insert the cd and restart
If you have a computer that has sp2 on it and a disc that has sp1 on it it can cause this issue.
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most probably your cd drive lens is dirty; try a lens cleaner.
dgrrrAuthor Commented:
venom - So if I'm using the exact disk I used to install the OS, then I can rule out content as the cause, correct?

nobus -- I assume a "lens cleaner" is a disk of some kind? Or do you mean going into the door of the device, and claningwith a tool?  Or taking apart the device and cleaning witha tool??
i have it in the form of a cd, with little brushes on it.
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