A friend had trouble starting up his computer because it halted at the welcome screen. He had to Ctrl+Alt+Del ones to get it past. I ran Chkdsk F to fix this problem. I have found a handy guide at eguide.com how to go about running the valuble tool Chkdsk F included in Windows XP to automatically fix the problem. You can find it here (click this text). Or you can read the following text in this post.

In case of that page disapearing in the future, I copy & paste the text on to here:

How To Run Chkdsk F in Windows XP (a direct copy of an article at the ehow)

A copy & paste from an article at the ehow

An extra note: I did not have to go through step 10. At mentioned in step 9, the computer adviced to run the Chkdsk at the next reboot.

Fixes, HowTo