Please Help!! NP8660 FREEZE!!!

I got my NP8660 about 10 days back, and installed Vista 32bit on it. It freezes up, specially while watching videos, however it has frozen up otherwise too. I am running Vista 32-bit, and have reformatted and reinstalled everything, including the drivers. Ran a checkdisk, but nothing showed up on that. The laptop runs cool, and I really dont think its a cooling issue. The freeze just locks up everything. No mouse, keyboard response. The screen stops exactly where it was, so does the sound, if in a video. Updated vista, and no new updates are available at this time. And this happens pretty often, a lot more often while watching videos.
I tried the video driver on the CD provided by sager, are there any other 9800M GT drivers which are compatible with NP8660, or is it not related to the video driver at all?

 

I don't think it has to do with the video driver, but you can try this: http://www.laptopvideo2go.com/forum/index.php?showtopic=20455
run a HDD diagnostic test see if it got bad sectors. also have you defragmented your HDD?

 

Run a hard drive check (checkdisk) in windows, to check for any hard drive errors/bad sectors: http://pcsupport.about.com/od/fixtheproblem/ht/hderrcheck.htm

Then I recommend running Memtest86, as the other thing it could be (and it is likelier to be this) is bad RAM (or badly seated ram).

 

^^ I agree.

Harddrive:
- Start > Programs > Accessories > right-click on Command Prompt, then "Run as Administrator"
- (in Command Prompt) type: CHKDSK C: /F
- choose Yes, and restart the system to let it do a auto CHKDSK

Memory:
thread here:
http://forum.notebookreview.com/showthread.php?t=142746