BSOD watching video and sometimes browsing IE or FF

When I am watching web video - news site video (CNN, WSJ, FOX) or YouTube, a few minutes into it, my system restarts. Also, but less frequently, I get random restart on browsing with both IE8 and FF.

See my profile for specs - basically Win7 32 bit OEM on a 5 year old P4 system. Its fully patched.

I thought it might be my Avast and Ad Aware so I uninstalled these and installed MS Security Essentials. Its fully patched too. I have updated my video drivers and installed an MS Codec update.

The restarts are still happening.

The case gets decent air flow and I even slipped the side panel off, blew out some dust. The CPU temp seems fine so I dont think its a thermal warning.

I tried the instructions to generate a minidump file, but no luck. The zip file has all my settings re: minidump as per the thread. See word doc in zip file.

I am open to suggestions. Please see attached.

Thanks

Howdy - its been almost a week. Can someone take a look at the attached and reply please?

Thanks

Nude phot0 of Faith Hill

Maybe that will get someone's attention and a reply to this post.