Before I installed Win 7 I had Vista 64-bit and on other computers Vista 32-bit, Win XP 32-bit and everything worked fine. I'm suspecting network driver because Win 7 doesn't recognize automatically. It was necessary to install driver for network card later. I installed network driver for Vista 64-bit with no compatibility problem..... As I said PC with Win 7 is seen and communicate with no problem from all computers in network, I just don't see the PC with XP 32-bit from Win 7...