Seemingly Random BSOD - Even after reformat/reinstall

I recently reformatted and reinstalled Windows 7 because I was getting BSOD at random times. Well, that didn't really fix it, as it's still happening. I really don't see a pattern at all, but I have attempted to follow all the posting instructions. If anyone c an help, I would greatly appreciate it.

I've been trying to keep track of what I've been doing when my machine crashes. Here are some of them:

-Installing Microsoft Word
-Unzipping a folder
-Restoring a session in Firefox
-Running that Blue Screen Report Utility
-Typing this reply

Also, Firefox has been crashing, and AVG gave me a warning that it was using too much memory (I've never seen that before). Also, when I was in safe mode, Windows said that it has encountered a critical error and would restart in one minute.

I have attached another zip file