Hi Rossy,
I have just been reading your issue, as I have the exact same problem - win vista, got the sirefef virus, MSE stopped working so I reinstalled it, and now my pc reboots every 60 seconds.
I see you managed to get yours cleaned, but I can't see anywhere how you got it to stay logged in long enough to run or download anything as I have no way of stopping it rebooting every 60 seconds and have no time to do anything.
Did I miss how you got around that problem?
Many thanks
PJ