Microsoft windows system security engineer
You installed, norton... I hope you like them because your stuck with them. They have the absolute worst resourse issues on planet earth. The RTVscan will run continuously, and there is an added "new" scan that runs on top of that on boot. If you never shut off your PC you should be fine... But good luck with that in vista.. (removing norton to install another AV, you can try Nonav, but it will most likely be easier to reformat)
Removing Defender requires extensive modification of your registry, i will not tell you how to do this, as i do not want to see a post on here about how your PC will no longer boot.
I would suggest stopping the service, you will get pop-ups warning you that this is disabled..
I would also disable superfetching, which will speed up your pc, unless you use it for games alot... superfetching is just an annoyance... and steals memory to run..
I would recomend staying away from AVG as they have the highest false possitives out of any AV or spyware scanner, in other words it will tell you that your PC is infected with a print driver... helpful!
Check out this site, they will tell you pretty much everything you need to know about AV and spyware....
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