That would depend on what you upload...
NO
It depends on what computer you have for wizard101 to mess up your computer.
depends on what you download can limewire mess up your computer
if you use it improperly, it can very well mess up your computer.
Minecraft doesn't mess up your computer. Minecraft is a malware free program.
No it cannot
No Browsing is just looking i.e. neither uploading nor downloading Uploading is puttings things from a computer on to a site Downloading is from a site to a computer
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