Driver_IRQL_Not_Less_Or_Equal BSOD [HELP]

[Vigilia.Procuratio]

 
As a mere hunch, Peter, do you have more than one resident anti-virus or firewall installed (not one of both, but multiple)?

Next time you get this error, note down the system file which is causing it, as in the bottom highlighted part in this image...

http://www.computergarage.org/wp-content...-error.jpg

Also take a look in Device Manager, which can be accessed via Start -> Run -> enter eventvwr.msc and then look under Windows Logs on the left-hand pane for anything which might possibly relate to this.