Hey Palbertsma,
It's radicalb21. First let me welcome you to the forum. What MacLover2000 told you is correct. There is no way I know of other then what MacLover2000 said. But once you have put a checkmark in the box on the system restore tab. Restart your machine. Once the system has been restarted do not forget to uncheck the box you checked in the the system restore tab to turn system restore bis is done ack on. Once this is done I would suggest some form of backup to either CD-ROM or DVD medium that way if you become infected you can restore your system to an earlier time prior to infection. Also for future reference you can go into disk cleanup under system tools go under more options tab and click the cleanup button under system restore section and it will delete all but your most recent system restore point. Hope this helps.