I upgrade a Vista Computer to Windows 7 Ultimate. Everything went uneventful until the very end, when I started getting hit by a virus attack. I stopped everything and started scanning. The computer had about 600 Threats. I cleaned it up then restored some files and settings – then every thing disappeared off the desktop. I worked on the computer until everything returned to normal. I have never seen anything like it. Threats were coming in from everywhere. Could it be that during an upgrade computers are wide open to attack. Well in the future I will find out about this then post about it another day.