Ive tried to install windows vista 64 bit onto my PC but failed showing a blue screen. I kept trying to install it but decided to install 32 bit instead which does work but Id like to give it another shot with the 64 bit vista. I know my PC can handle 64 bit because it came with a trial 64 bit version which ran out. I was wondering if my PC will become damaged if Im always re installing and switching it off by the power without shutting down. Also do I need a registry cleaner?