HELP!! Authorization in the same laptop with different operation systems

My BF installed Win 7 operation system on his laptop yesterday and re-authorized it when he used iTunes. However, when he finished authorization, a dialog block showing that "*Including this one, you have authorised two computers out of your available 5*" appeared; what's worse, when he connected his iPhone to the laptop, it deleted all the bought apps in the iPhone, instead of synchronizating.
I also want to install Win 7 operation system, but I'm afraid that the same thing would happen again (to my iTouch).
We're quite confused that why the authorization in the same laptop with different operation systems is counted as two times. Friends who know please tell us whether this is the case.. If not, please tell us how to deal with it as we frequently re-install operation system for quicker operation.
Message was edited by: Shiwen
Message was edited by: Shiwen

It's the *operating system* that is authorised, not the particular user profile or the hardware. Before upgrading/reinstalling deauthorise and you won't run out...
tt2

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