I used to buy my AV package from Computer Associates (e-trust EZ antivirus), but when I changed to Win XP, it didn't recognise it.
Several E-Mail enquiries later, having had no response from CA, I downloaded AVG Free 7.0. What can I say, automatic update on dial up, and never a smell of a virus since. With that, zonealarm, and AdAware 6 my PC seems to be pretty bullet proof.

Also, much as I dislike and distrust MicroClot, I have to speak from experience, and say that, since changing from 98SE to XP (clean instal to NTFS), I haven't had the smell of a crash either. It seems totally stable, and runs more programs, more quickly.
You have no idea how much I (as a long time MicroClot sufferer) hated to have to say that, but it's true. I suppose even they must have one satisfied customer.

Don T.