Ya minecraft may mess up your PC because that software doesnt have SSL certificate's.which is used for secure transaction.
It depends on what computer you have for wizard101 to mess up your computer.
No. Minecraft is safe, provided you download it from the official website created by Majong, its developers. If you download Minecraft from another site, you could potentially be risking your computer's safety/security. Not all .jar applications are safe!
depends on what you download can limewire mess up your computer
if you use it improperly, it can very well mess up your computer.
NO
No it cannot
Not that I know of, but it might mess up your game if you input too much.
If the Windows is messed up, then yes. It will mess the computer up.
yes it can
No
No.