The computer crashes are random. Sometimes one right after another (crash, reboot, crash). I normally keep my computer running, and reboot it every few days...and sometimes daily, just depends. 3 of my crashes happened while I was typing something.
I'm currently using google chrome as my browser (majority of the time, and occasionally firefox 3).
Yes, I'm using Eset Nod32 4 antivirus. I run sweeps almost daily, and it is currently updated (as is windows).
BTW, im running windows vista (really sucks).