|Most likely, your computer is having some kind of error before you get to the Login Screen. By default, Windows is set to automatically restart on system failure. So to fix this, press F8 on the BIOS screen (The first screen you see on your computer when you turn it on). Now select "Disable Automatic Restart On System Failure" and select "Windows XP", then boot up your computer. (NOTE: If you restart your computer again, you have to do this over again.) Does your computer display an error message? If so, post it here.|
Ask and Answer. The way of learning.