Blue screen problem

My laptop freezes up randomly..and especially when I'm on the YouTube site.
It will freeze up half way through the videos and then I have to shut down
manually. Would appreciate assistance here please.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 9f
BCP1: 0000000000000003
BCP2: FFFFFA80048E9060
BCP3: FFFFF800046F1748
BCP4: FFFFFA800445FE10
OS Version: 6_1_7600
Service Pack: 0_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\040811-19765-01.dmp
C:\Users\Sharon\AppData\Local\Temp\WER-97329-0.sysdata.xml

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 9f
BCP1: 0000000000000003
BCP2: FFFFFA80048E9060
BCP3: FFFFF800046F1748
BCP4: FFFFFA800445FE10
OS Version: 6_1_7600
Service Pack: 0_0
Product: 768_1

I am using IE 8

Found this rather daunting, hope I've done this correctly :)

The health report indicates that the Security Centre is unable to
identify an active anti-virus application. I am using AVG Free
Edition and is active. How do I configure Security Centre to
stop monitoring anti-virus status please?

Thanks so much for your assistance. :)

Will try uploading the zip file again !!