Can you interpret this error message? Please help.

My new pc is getting the blue screen every few hours or so. I've got a 790i board, Q9300 CPU, 9800GTX, 2Gigs Corsair DDR3, and I'm running 32-bit Vista. I've tried formatting the drive and reinstalling. The problem persists even when I have no programs other than Vista installed. Any help is greatly appreciated. Thanks.

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: a
BCP1: 00000014
BCP2: 00000002
BCP3: 00000000
BCP4: 820BC449
OS Version: 6_0_6000
Service Pack: 0_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini051408-02.dmp
C:\Users\Mason\AppData\Local\Temp\WER-113631-0.sysdata.xml
C:\Users\Mason\AppData\Local\Temp\WERDD43.tmp.version.txt

Thanks for the suggestion. I ran memtest and the memory seems fine. I'm getting this blue screen of death. Looks like it might be the video driver? But I've already tried reinstalling it, and I'm running the latest version, which was released 2 days ago.