blue screen

hi guys i get this blue screen usally when im watching videos online the meage on the blue screen is

driver irql_not_less_or_equal

technical infermation
stop 0x000000d1(0x493bfb06,0x0000000,0xa19ccc63)
vsdatant.sys address a19ccc63 base at a19a7000,date stamp 4784afa8

if you need any more info please ask
please could some one tell me what this driver is for and how to fix this also when i leave my computer on over night i get a mesag saying it has recoverd from a unexpected problem i dont know if this is a blue screen error aswell because i was not there to see it.
thanks in advance for your time
marc

 

Easy one.

That's ZoneAlarm.

For some reason outside firewalls seem to cause the most havoc in Vista.

Personally I would uninstall it and stick to the Windows Firewall.

But if you really want it, try reinstalling it. Make sure you have the latest version if you do.

 

cheerz mate thanks for your quick answer and help