blue screen problem

Can someone please tell me what the cause of this blue screen error is?

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: 101
BCP1: 0000000000000061
BCP2: 0000000000000000
BCP3: FFFFFA60005EC180
BCP4: 0000000000000001
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Follow these instructions if you want to be helped
Blue Screen of Death (BSOD) Posting Instructions - Windows 7 Forums

In addition, install SP2. Then use the computer and if you get another BSOD, download that dump report.