I had the same problems with the latest Intel Matrix Drivers. I would get a BSOD while gaming or just while surfing the net. I got the iastor.sys error. I never had that problem with the previous matrix drivers. I didn't change any hardware, it all started with the newest driver. I reformatted my HD and went back to the previous driver for the intel matrix ahci and haven't had a BSOD since. I think its the newest drivers their forked....