Blue screen on Vista problem

[afiq6161]

I do not know what happened but my brother said that the computer suddenly shows a blue screen and restarted the whole computer.
Im using Microsoft Windows Vista

Manufacturer : Hewlett-Packard Company
Model : p6145d
Processor : Intel (R) Core (TM)2 Duo CPU E7400 @ 2.80 GHz
Memory(RAM) : 2.00GB
System Type : 32- Bit operating system

The blue screen said something about BIOS but i dunno what is it
It also said it dumps physical memory...
Is it a virus cuz I've been downloading a lot of videos and installed games and entered untrusted sites into my computer

I thought that my Avira Internet Security Suite can protect me but now i dont trust it anymore

So I beg help to you guys PLEASE HELP ME!!!

 

[Route44]

How to find and post your Minidump Files:

My Computer > C Drive > Windows Folder > Minidump Folder > Minidump Files.

It is these files that we need (not the folder). Attach to your next post the five most recent dumps. Notice the Manage Attachments button at the bottom when you go to post the next time. You can Zip up to five files per Zip; if you only have one or two you don’t need to zip them, just attach as is. Please do us a favor and don’t Zip each one individually.