Blue Screen

I am running windows Vista 32 bit on a Toshiba Satellite Laptop and keep getting the blue screen error. The following is information relayed from windows:
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 50
BCP1: B3E97000
BCP2: 00000000
BCP3: 82126558
BCP4: 00000000
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini092008-01.dmp
C:\Users\Shawn Martin\AppData\Local\Temp\WER-71464-0.sysdata.xml
C:\Users\Shawn Martin\AppData\Local\Temp\WER9B73.tmp.version.txt

This problem was caused by WinNT / Bagle.gen, a known computer virus.

WinNT / Bagle.gen is also known by the following names:

Win32/Ursnif
Trojan-Downloader.Win32.Bagle.cu
W32.Beagle.GM
Troj/BagleDl-DB
Troj/Bagle-TH


If anyone has any suggestions/insight please let me know. I run the newest AVG and when scanning it comes up with nothing. A few weeks ago my AVG was down for some reason and I had to reinstall, perhaps while it was down something got in. Thanks.