BSOD Need Help!

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: d1
BCP1: 00000000
BCP2: 00000030
BCP3: 00000000
BCP4: 00000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\092011-25078-01.dmp
C:\Users\Jay\AppData\Local\Temp\WER-105078-0.sysdata.xml



win7 ultimate x86, just got the computer for free, was running xp fine, upgraded to win 7 after it came out while back, ran fine for years, did a fresh install bout a month or two ago and it started bluescreening

any help is appreciated!

thanks!

anyone want to help?