No internet conn. w/my IMAC in Windows XP

I recently loaded Windows XP on my IMAC that I purchased from the on line dealer Elecsurf_PC. I can not connect to the internet when the computer is in Windows mode. This was not a problem until the required Windows registration period expired. Now I can not even open Windows. I thought I just needed a Windows XP internet driver, so I tried to find one on line, but I can not seem to locate one. Am I correct? If so where do I get the driver?

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