XP startups up but the blue screen shows and then the pc restarts... What to do?

this article is about Why the pc reboot itself? http://www.keep-pc-clean.com/why-the-pc-reboot-its...

pc reboot or get bluescreen may be cause by a corrupt registry

fix it by Registry Easy , it works well

http://www.keep-pc-clean.com/

or you can google some other pc cleaner

http://www.google.com/

You're caught in a 'boot loop' which sometimes is a low level boot sector problem.

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It often fixes many HDD physical problems and /or recovers data.

Google for reviews, or go to:

http://www.grc.com/sr/spinrite.htm

for further details.

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(from GRC site)

If you have a HP computer and you upgraded to Service Pack 3. It might do the restart sequence. The website has a fix for it.

If you recently installed software, then that could be the problem.

Run your computer in safemode, and run msconfig.

Then go to startup and uncheck everybox in 'startup' that is not Microsoft Corporation.

Then delete everything in %temp%

A lot of reasons: might be problem with your RAM, might be Windows corruption etc. Try unseating your RAM module or swap them if you have two.