BSOD when I play games or surf the Internet

[cromat]

This problem started few weeks ago, I dont know why.
BSOD says its memory management problem. Can you please check my minidump files and tell me what I should do with my PC.
Thanks

 

[Tmagic650]

Avast is causing this BSOD. Remove it and download and install Microsoft Security Essentials and see if the BSOD's stop