Cleaning my computer

I have a bit of a problem I am using a school computer and we can't install games on them so I want to ask what is the easiest way to clean the computer of anything that has to do with games without leaving any traces whatsoever and without formating the harddrive

download a file shredder and shred the files, then run a reg cleaner. Then defragment.

what 's a file shredder?

a program that destroys files by overwriting them with random data.

I hope it works with everything I guess we will see on monday

wouldn't he need a administrator right to run those things lol like installing the program i am sure thier school has turn off certain function of the computer.^_^

depends, if its a portable app then no. Besides, he's managed to install games.

are you home schooled or is this at school?, advanced uninstaller has a file shredder that you can use for 30 days

No I use my computer at both the school and at home and I have admin rights.