Here’s what I get from reliability monitor:
3/3/2011 (First occurrence):
Failure Type: OS Stopped Working
Version: 6.0.6002 Service Pack 2
Failure Detail:
0x00000001
(0x00000000770a6cba,
0x0000000000000000,
0x000000000
Failure Type: Boot Failure
Version: 6.0.6002 Service Pack 2
Failure Detail: 0x1

3/6/2011:
Failure Type: Boot Failure
Version: 6.0.6002 Service Pack 2
Failure Detail: 0x3b