Right, having taken out my tv card and uninstalling the driver through device manager, I was still experiencing BSOD. I was struggling to remove the registry key as suggested in perfmonreport in regedit, but managed to find a way around this by showing hidden files in device manager and then deleting the non plug & play device which corresponded to the registry key mentioned in perfmonreport. Interestingly, an AVG entry was also shown here, even though I'd uninstalled/removed files/made registry deletions previously, so I uninstalled this also. System seems to be more stable now and I've not experienced BSOD since these final changes.
Hope this helps anyone who is having similar problems, I'll keep you updated if I see BSOD again!