I suggest you run sfc following the steps below.
After the scan you will not see a report on your desktop, so if your computer is not running any better, please go to this LINK
and follow for additional help.
To be on the safe side I strongly recommend that before doing anything at all you check that your back up/archive/copy of all your important data, drivers, files, settings, work, etc is 100% up to date accurate and reproducible, (even if your back up is even only a day or so out of date, it's worth updating it now.)
Also don't forget to check that you have all your application Installation CD's to hand together with the product keys (including those for Windows itself)Windows Protected System File Checker SFC
sfc /scannow (note the space)
Have your Win XP installation disc handy as if damaged files are found they will need to be copied across from your disc, if SFC can't find correct copies elsewhere.Windows XP Installation disc not available or wrong Service Pack - SP1 when SP2 is needed
There are work- arounds to this problem but the easiest, by far is to borrow one and use that. It is perfectly OK to do this, for the purposes of running SFC,and if you ask around all your friends, you are likely to find someone who will be able to help you out.
Edited by tallin, 15 February 2008 - 06:34 PM.