Random BSODs, most with error 0x0000001a

Hi all,

This PC has been experiencing random BSODs for a couple of months now. I've taken this machine to a repair place, but they were unable to recreate the BSOD, but also apparently couldn't review dump files or do any other analysis of the crashes, so my faith is greatly diminished.

Anyway, I've recently done a fresh install of windows, replaced the RAM (currently at 8gb), and updated the ASACPI.sys driver from the 2005 version to the 2009 version. At this point, I have no idea what to do next. I think there is a bios setting throwing everything out of whack, but I honestly don't know enough about bios to feel comfortable poking around in there.

System basics:

Win7 Home Premium 64bit
Custom built system with Win7 being the only OS ever installed on the system.
Full retail version.

The system is about 1 year old and I reinstalled Windows last week
(Monday, 11/21 ). No blue screens until the 26th. There've been 5 so far.

Attached is the BSOD file and the perfmon.html report as requested. Please let me know if you need anything else. I'll be very grateful for any advice/suggestions offered.

Thanks!

Here are the .dmp files if the other bunch doesn't have the right info.

Thanks for looking!