hafter installing the service pack a cannot open any program at all, every time i try to open anything a message "application not found" appears. none of my program are working, any help please
You probably didn't install it properly. And since SP2 installs over SP1, your only real choice is reformat. Unless your system restore happens to be working, but if you're smart, you would've disabled it as viruses use it to 'regenerate' themselves.
