I have the same problem, but my mb is asrock h67-ge which has hd 2000 graphics. So you can see how old the problem is. I tried oem, intel, microsoft drivers (windows update), changed dvi & vga cables, all did f*ck all. In the end, I bought a cheap and quiet gigabyte hd 6670 card (GV-R667D3-2GI) and all is well for the last 2 weeks, touch wood.
Trust me, posting your problem here is next to useless. Just get a card, any card, and save yourself weeks of aggro. To paraphrase Jobs, life is too short to **** it all away.