Critical Files Unrecognised error

[someone]

You may have lost some files on your hard disk when you
left your computer, most likely from a slight power surge.





>-----Original Message-----
>I am fairly certain I left my computer on, and when I
>came back the
>next
>day it was off. I booted up, and when I signed into
>windows (XP
>Professional) I got a message, something like "Critical
>files are
>unrecognised by Windows and must be replaced to maintain
>stability -
>Enter your Service Pack 1 CD now to restore files to
>originals" (not
>the
>exact message I got but something like it). Now I cannot
>sign into MSN
>Messenger, Hotmail, MSN Explorer, FilePlanet, mabye a
few
>others. (There may be more but these are
>the ones I have noticed so far). I couldn't find any CD
>like the one
>the
>message mentioned, but I inserted my Windows XP
>installation CD, the
>install screen came up, and the error went away.. but
>nothing happened.
>I'm at a loss as to what to do now.. any help would be
>greatly
>appreciated.
>Thank you for your time.
>.
>