Running Win2K SP3 with latest updates. If Norton runs long enough I get BSOD irq not less or equal in vsdatant.sys. I read that this happend in ZoneAlarm (I think) before and can also be caused by a W32.Gunsan worm, but I have checked with AV program and no viruses. I posted this in software forum with no resposne so I post it here as well. I want to be able to contiune to use Norton as it allows access to my work VPN. McAfee won't even when disabled. Any other ideas? Help Please!