Get a Mac?
Seriously, I use my ancient iMac for web cruising and physically isolate my wintel box from the internet as much as possible.
Wish I knew a simple cheap way to resurrect yours, though.
Get a Mac, run VMWare Fusion to create a windows virtual machine, and use the snapshot feature often.
That way, when a virus gets to windows (and it will), you just restore to the virtual snapsot and keep on truckin’