You have probably reached the authorization limit on your account, and will need to deauthorize some other computers. See the related questions for more info.
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The iTunes software, account and its authorisation are free. You only pay when you decide to buy something from the iTunes store.
If you have a 32bit or 64 bit computer, you have to get the right itunes, or it wont work right.
Authorize and Deauthorize Computer controls are accessed from the Store menu in iTunes. To authorize a computer open the iTunes software and select Authorize Computer... from the Store menu at the top of the screen. (Next to the "file, edit, view, and control" tabs) Register for an iTunes / Apple Account, Register Your Mac (if you are using one). So lets recap, If you are running a PC with windows, you must register for an account. If you are running a mac, you must also register for an account. (But you also do so when you register your mac)
You access itunes on your computer by opening up the file to where you've downloaded itunes to. You open the browser to where itunes has been saved and will restart your computer once you've clicked on it in order to add itunes onto your desktop.
no, itunes is very safe and causes no such problem towards your computer