Computer Autoreboot

 Help plz! My computer always autoreboots after the loading screen. I have a Windows XP pent. 4. Can someone plz help me fix.
P.S This happened right after I downloaded a game and I got the message not enough disk space. I turned off the computer and this problem happend ever since. I want to uninstall the game but don't know how. Safe mode doesn't work.

Safe mode doesn't work

Means?

 Once I select safe mode, It just autoreboots.

Your low disk space may be the cause of all these problems, but let's try something...

1. If you have Windows CD, follow the steps from here: http://icrontic.com/articles/repair_windows_xp

2. If you don't have Windows CD...
Download Windows Recovery Console: http://www.thecomputerparamedic.com/files/rc.iso
Download, and install free Imgburn: http://www.imgburn.com/index.php?act=download
Using Imgburn, burn rc.iso to a CD.
Boot to the CD...let it finish loading.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Then, follow the steps from here: http://icrontic.com/articles/repair_windows_xp, starting below this picture on page 1: