Laptop BSOD/System Restore/Logs out??

[smashedpumpkins]

Okay my laptop works great all day long... However every night I have issues. These issues started about a week ago. Here's the story...

Currently I'm trying to enroll in some classes in college, but the classes are full. So to try to get in these classes I use an auto refresher built into FireFox. Works like a charm... However I must leave my computer on all night when I'm asleep. I've done this for a few years now each semester, but now I'm having trouble.

Everyday I wake up to my Laptop having either a BSOD, recovering from a system error (Attempts System Restore), or the Laptop just logs out. (Closes everything when it logs out)

Not once have I had this problem before or during the day. Just when I leave it idle for more than a few hours. At first I figured it might be overheating... But after a few random methods I'm positive it's not overheating. I've scanned my computer with AVG and nothing shows up. I even went as far as to download an auto clicker that would keep clicking to maybe make it seem like I wasn't idle. But still nothing...

Any ideas? I'm lost now.. Thanks!

EDIT: This is my laptop details. http://www.techist.com/forums/f84/hp-pavilion-dv5t-1098-99-a-187142/

 

[Jorsoft]

The first thing I would do is pop a hard driver tester in there and then a copy of Memtest. A lot of HP computers have built-in diagnostic tools, they should be good enough for this. Usually it's F12 or F9 I think during bootup (it should say on the screen). I'd give those a whirl.