Computer restarting problem

[SmokiestGrunl]

Ok for some reason if I try to change any firefox setting after I click ok/apply it will restart my computer. No warning what so ever, computer just turns off then reboots.

 

Things that maybe affecting it:

 

I recently upgraded to Firefox 3

I recently got Zonealarm ForceField

I recently got McAfee SiteAdvisor - I have used it before but this never happened

I recently upgrade Zonealarm Security Suite 2008

 

EDIT: This happens when anything is changed, new installtion, change setting. It no longer is just for Firefox.

[SmokiestGrunl]

Fixed, closed.