itunes
You can access iTunes after downloading by opening the app from your computer’s Start menu (Windows) or Applications folder (Mac) try visit mtcgame website, you can purchase a gift card from them if you need
you can put it on a memory stick
plug it in your computer
iTunes for the computer is very different than the iTunes that you have on your iPod Touch. You can only have the iTunes from your computer when you download it for your PC (not for the Mac, there are two separate iTunes softwares) from Apple's website.
If you have iTunes program installed on your computer and the computer is connected to the Internet then you have all you need
you can og into your itunes account from the other computer
Your iTunes balance is saved server side. Long story short, as long as you log in with the same account on the other computer's itunes client, then yes.
Yes - go to http://www.apple.com/itunes.
Sync your iPhone to iTunes on our computer
Connect it To your computer on iTunes
no, itunes is very safe and causes no such problem towards your computer