Windows 7: BSOD While Video Editing- BlueScreen OS Version: 6.1.7601.2.1.0.768.3

Hello,
Have had infrequent and seemingly random Bluescreens over half a year now. One in October then 6th Dec, 29th Dec, 2nd January and yesterday evening. I have posted the report details below and have attached a zip file of my pc as instructed. I have also created a Kernel Dump for next time it crashes. Have also noticed that in my drivers 'Chipset Family PCI express Root Port 3' is missing (I have 1,2 and 4?) I do not recall deleting this but it may help solve the problem! I often update my drivers and have recently installed the latest driver for my Graphics card (pre crash!). In addition to this, system performance seems a little sluggish at points but that may be fatigue (have had the laptop for a year)

Problem signature: Problem Event Name: BlueScreen OS Version: 6.1.7601.2.1.0.768.3 Locale ID: 2057 Additional information about the problem: BCCode: 116 BCP1: FFFFFA80071314E0 BCP2: FFFFF880059DF404 BCP3: 0000000000000000 BCP4: 0000000000000002 OS Version: 6_1_7601 Service Pack: 1_0 Product: 768_1

Thank you very much for your time!
(Have checked for solution elsewhere unsuccessfully)
Ben H

I have found extra information so please help!
Here is the report:
Problem: Video Hardware Error
Files that help describe the problem:
WD-20121202-1024.dmp
sysdata.xml
WERinternalmetadata.xml

Go through the troubleshooting steps on this link: STOP 0x116: VIDEO_TDR_ERROR troubleshooting