NIS 2011 "Performing background tasks" problem

Hello,

I recently upgraded from Norton Internet security 2010 to the 2011 version... BIG mistake and i wish i had waited,  now when i leave my pc idle NIS's background tasks locks up my pc and i have to cold reset it.  This never happend with NIS 2010 and its background tasks.  I am running XP with SP3 . Have 2GB RAM and a fast AMd CPU.

Hope you can assist as this is a real problem.

Thank you, flusy.