I keep system restore off permanently because worms will install themselves to that location, and since restore protects changes to that data, you can not fully remove the problem you have detected, unless system restore is disabled. I just clone my PC from time to time on a portable hard drive and that works MUCH better. Sure It cost 80 bucks for the hard ware, but I have absolute peace of mind. I know my data is safe, I know I wont be reinfected if I use restore, and of course, system restore is a monster resource hog, and it rarely operates properly from what I have seen on computers I have been asked to rescue. Why waste valuable resources on your system with a back-up program that helps infections stay protected? Do it yourself, have a faster computer, and more space on your PC; means faster searches of your database and you have peace of mind in case your computer is destroyed, or stolen. Keep your back-up HDD in a safe, dry, low EM/micro radiation area... and all good. Hope this helps!