Windows corrupted - what do I do?

[FMook]

If you can get the machine running, you can try using this
command line utility:

sfc /scannow

System File Checker (sfc.exe) is a command line utility
that scans and verifies the versions of all protected
system files after you restart your computer. If System
File Checker discovers that a protected file has been
overwritten, it retrieves the correct version of the file
from the %systemroot%\system32\dllcache folder, and then
replaces the incorrect file.

You will need your system CD for this to work. I am not
certain but if you have SP1'ed your system, this utility
will expect a SP1 disk.

Regards,
FMook

>-----Original Message-----
>Strange things are happening on my Windows XP machine.
>The "Add/Remove Programs" program no longer opens.
>The "Shut-Down" screen appears "see-through". The "Help
>& Support" option on the Start Menu does not work (a dll
>is missing).
>
>I don't know what has happened, but I would like to re-
>install XP over the existing install, without having to
>resort to boot disks that wipe out all of my personal
>storage. Is this possible?
>.
>