well you can to a certain degree....you open the door for someone to come in and poke around and screw with the registry, or modify some key files, or just do a system restore which can help out a computer. I would never let any access to my computer unless I was there to witness what was going on and to have enough education to keep them honest.
Yeah, I also wouldn't listen to anything on TV anyways lol. If you need your computer fixed for some reason or whatever and you don't know what to do, and I have free time & cash to go there, I can help you lol.
But most other computers I go on are slow to me lol... To used to my computer I guess and I still want to upgrade but will probably wait until this time next year to do it .