probably this is not the problem, but just in case: when you connect your PB902 via usb, a pop up screen should appear on the device asking whether you want to charge or connect. When you connect, the screen goes blank save for a symbol (which one will depend on the firmware version). When it charges, the device keeps working as normal.
If you do get the pop-up window, then just select that you want to connect. If teh pop-up window does not appear, it may be that the default upon usb connection is charging. If the latter, you have to change the settings in the configuration menu. The problem shouldn't be win7 (e.g. I do not have any issues running WIN7).
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