Will windows be able to recognize those games or will windows registry be screwed up? I’m referring to doing a clean install from vista to windows 7.

My Pc had a virus attack which has hacked registry settings and some of the registry settings got changed due to which I cannot even go to the task manager, Folder Options etc. I have installed the antivirus and cleaned the virus but I cannot reset the registry settings can any one tell me how to reset the default register settings in windows XP.

Windows XP Product key?

MY computer recently crashed and went to a repairguy. ( A friend of my dad fixed it) Now since the computer crashed he put a new hardrive and basicly most of the files are missing. So i was trying to reinstal Mcafee and IT said my software product(windows) is out of date and need to be updated. So i go on windows updater and it says my product is not genuine.
I go on my computer and i click properties and i see the Registered to: section got changed and had the repair guys name. SO now the PRODUCT KEY IS CHANGE AND WIndows thinks its now a fonny any ideas on what to do

i thank i must be attacked by harmful web code, help.