Im running a cisco WS-C3508G-XL-EN with software 12.0(5.4)WC(1) and 4 WS-G5482 1000Base-T GBICs connected to and 1 Intel Pro 1000-T (Driver version 2.84.284.0) network Card and 3 3Com 3c996-T Gigabit Copper Cards (Driver Version 1.29). All the PCs...