USAFRet :
That is near impossible. You can go through and 'uninstall' all the applications you've added, but there are almost certainly remnants left behind.
Why are you doing this? To sell it?
I wanna do this just to clean my second computer. Is there any program that can unistall lots of apps 100% automatically for me. Like say i wanna uninstall 20 programs, I can just choose them then it uninstalls them automatically without me having to press NEXT, NEXT, NEXT everytime