virus/trojan, complete removal

i got infected by renos.au. i have been able to stop it's naughty behavior up to a point, or in other words i do not get it's surface effects that haunt windows defender and avg antivirus-free. i removed all the yur* files and the registry entries to run them on startup but when i uncheck the startup items in msconfig they immediately reappear when i click apply as do 'group policy client' and 'task scheduler' in services, whan i disable them. so i am a little lost, confused and tired of trying to review event logs and figure out what is going on. btw i also had an open port for uTorrent which i am not using, so i shut that port down.

i have not installed hijack this because i don't know its compatibility with vista. i uninstalled the logitech desktop manager because it used backweb and i run the bit torrent client Vuze. recently i noticed that my router was reporting extensive port scanning (mostly when i have vuse running) which has stopped now, besides the fact that i changed the port for it. last week i reinstalled vista and went through the laborious process of reinstalling all my software, but was very disappointed yesterday on reboot to discover i was reinfected.

can you help?