[big black dog]

Please don't take this the wrong way, but are you sure you're doing a complete reinstall? That should have absolutely ground zeroed your PC.

I had an IT person I work with clean up my hard drive after I had a similar problem a couple of years ago. She installed a program you can access at start up (by hitting F10 as the system is booting up) that will restore your system to its original configuration, while saving your files. I'm not sure if the virus can infiltrate this program, but it does get rid of the problem, at least for a while.

[throwback]

Hmm. It doesn't sound like a real fresh install. I'd try what Genoa says above. Hunting down the critters is usually one huge pain in the _ss, and you might blow something away that you shouldn't. Maybe someone will correct me, but I think virus's always have to lay in the startup chain somewhere for them to come back to life. If you can go back to a restore point where they are no longer in that sequence (probably the registry or something) they can't come back to life even if whatever they dropped on your PC is still there. If the restore doesn't work, I would go full nuclear next which is a reformat and reinstall. Like one fellow said above, nothing can survive that.