Whilst on this topic, a friend bought a Compaq laptop with Vista Home recently, this came with Norton free trial installed,...groooaan, I have had big probs with this before on a previous Toshi laptop I own.
I un-installed Norton and down loaded and installed Avast Home free version. On restart it went into what looked like Dos mode and started to do a virus scan. I left this for a while and came back and the laptop had turned itself off and could not be restarted. After a sometime of doodling around it started and wanted to do a Windows check as something was not installed correctly, or a conflict. I opted to use a system restore point to get back to where it was prior to Avast install.
So where to from here?? Is there a conflict with NAV(even though un installed, as has been my experience previously) or is it something else???
Any help much appreciated.

Cheers
P