Another Blue Screen Thread -Help with Error Codes

I have had an HP Pavillion PC for about 1.5 years now. While it took a little while to run with some form of stability (I chalked it up to early Vista release), lately I have been getting the BSOD pretty regularly. I have gone the route of a system restore (removing all files and apps and starting from the "day 1" out of the box status). I actually had to do this a couple of times because the PC would hang at a few places during the restore (didnt seem like a good sign to me). Once I got Vista reinstalled (yesterday), it ran fine most of the day but apparently sometime last night the BSOD happened again. I got the follwoing error message:

Problem signature:

Problem Event Name: BlueScreen

OS Version: 6.0.6000.2.0.0.768.3

Locale ID: 1033

Additional information about the problem:

BCCode: 9f

BCP1: 00000003

BCP2: 840E8B98

BCP3: 860A3030

BCP4: 85A81830

OS Version: 6_0_6000

Service Pack: 0_0

Product: 768_1

Can anyone help diagnose this? One issue I had previously was that the built-in network adapter was a little unreliable - sometimes it would work and other times it would not. So this past summer, I just put in a new network adapter card to take care of connectivity and has worked ever since. Other than that I have not added anything else. Any help would be appreciated! Thanks.