Sudden blue screen and computer shutdown... Help!

[phzombie]

All I did was click to close Firefox and my computer suddenly got a blue screen and told me it needed to shut down to protect data. This has never happened before, and as far as I know I don't think I have any viruses. I'm going to scan, of course, to be sure. I'm using Vista 32-bit SP2, and I have the newest version of Avast! Internet Security installed. Please help.

[Left123]

It happens to me sometimes,it's CPU oveheat probably but it could be malware that causes the cpu overheat.Scan your computer with avast and let us know.

[Lisandro]

Please, zip and upload the C:\Windows\Memory.dmp file to this anonymous ftp server: ftp://ftp.avast.com/incoming/

Besides Google also you can use:
MS knowledgebase: http://support.microsoft.com/search/?adv=1
Free memory tester (Run it overnight): http://www.memtest86.com/
XP error explanations: http://www.xptuneup.com/xptuneup_stopmessages.htm
BSODs: http://www.techmetica.com/howto/descriptions-and-fixes-of-blue-screen-of-death-bsod-crash-errors/

[phzombie]

I just did a boot scan and it was clean. Also, I'm not sure how to zip and upload the file you mentioned... Sorry. ):

[phzombie]

Actually, could this be related to the Avast sandbox? I read somewhere that it might be, and I've only just started using the sandbox.