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USB problem

Hello all,
I am writing an application that needs to communicate with a PC over USB. My problem is that once I plug the USB cable into the embedded side, Windows XP reports "USB device not recognized". It does not even assert the embedded side requesting for descriptors (I know that because I never get a USB interrupt).
I checked the systems clocks, interrupts are enabled...
Do you have a tip?

Thanks in advance,
Tamir

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