OK so I've progressed on from my original errors involving Zone Alarm and now I am faced with a new problem (maybe involving aTI drivers?). My PC has crashed twice blaming ati2dvag.dll, the first time I didn't have minidump creation activated so i set it to Complete dump and got this. Have just received another crash! This time blaming Avg7core.dll which i have dutifully updated to a recent version so this error may no longer apply.