Those BSOD sources are all over the place. NIC; mouse driver; floppy controller; system; etc.
You appear to have a lot of Anti Virus software or tools which could also be a problem. You should only have one anti virus running.
Your tests would appear to suggest the hardware is good.
Wish we could get some dumps. Right click My Computer then Properties > Advanced > Startup and Recovery > Settings > Write Debug Information
Here choose Kernel Memory Dump and see if that starts recording your dumps.
Have you read this post:
http://www.d-a-l.com/help/showthread.php?t=50190