Strangely, the last recorded BSOD was in November.
I'm seeing some strange errors:
Log Name: Application
Event ID: 0
User Name: N/A
[Sink UploadLogger (Logger)]
BITS error for job file 445fd849131e0e30.avlog: HTTP status 407: Proxy authentication is required.
The only thing I can suspect is Trend Micro. Try removing it, and replace it with MSE: http://www.microsoft.com/security_essentials
Your Realtek network drivers
are old, dated from January 2010. Install these ones: Realtek
Also, update your Atheros wireless drivers: HP ProBook 4420s Notebook PC*-* Atheros Wireless LAN Driver - HP Business Support Center
verifier: Driver Verifier - Enable and Disable