Computer Constantly Reboots

Not sure Im posting this in the right forum.

Computer keeps rebooting about every 1/2 hour by itself.

Ran Ad Aware, Spyblaster, CC cleaner, etc., and it doesnt find anything.

Before I resort to a hardware problem, was wondering what else I can check

or if a posting a HiJack Log might help someone here help me, on why the

computer reboots and shuts down while itself, while Im in the middle of my work.

Thanks

 

- Download HijackThis 1.99.1

- Unzip the hijackthis.exe file to a folder you create named C:\Program Files\HJT

- Do NOT run Hijack This from the Desktop, a temp folder, or a sub-folder of C:\Documents and Settings, or choose to run it directly from the downloaded ZIP file.

- Before running HijackThis: You must close each of the following:your web browser, e-mail client, instant messenger, and programs like notepad, wordpad, MS Word etc. And any other unnecessary running programs.

- Run HijackThis and save your log file.

- Post your log as an ATTACHMENT to your next message. (Do NOT copy/paste the log into your post).