How can I sync my ipod without losing data?

I bought my ipod around half a year ago and had it synced and everything to my Mac for school. The school took my computer for summer and i backed up the files onto my external harddrive. But i have bought songs and apps on my ipod touch which is no longer connected to any itunes library.
How can i sync this ipod with a itunes library without losing everything on my ipod??
(note: the computer i am using now is a windows, with an itunes library that also has music bought on it)
Message was edited by: Aperson1234

Tough spot if you want Apple only SW, no idea where you can get where you want without some decent 3rd party SW, which as a rule outshines Apple's SW by light years.

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