but leave the system in a SP1 state. Then Windows Update will take care of bringing it up to date again. Worth a try.
Did you check
(a) what (unnecessary) programs run on startup
(b) what (unnecessary) services are started automatically
I am trying to fix a friend's computer after removing the internet antivirus pro virus and have a problem where upon boot up the computer basically freezes for around 15 to 20 minutes where no programs will work. All the programs show on the desktop but upon clicking on them they will not open. I have run a number of scans and no virus is left in the system. The only thing I can think of is that somehow the registry was altered and something is not allowing the programs to start. After they do start the system runs fine.