I have two WinXP-pro SR-3 machines on a LAN where they're normally linked to one another and the Internet via a D-Link DI-524 router. It works fine nearly always, but on occasion the LAN connection fails and the two machines cannot see one another, BUT they both can still access the Internet. By "see one another" I mean that Machine A can no longer print to the printer connected to Machine B, and Machine B cannot read the contents of shared directories on Machine A. NEARLY EVERY TIME when this happens, the background color of the start bar changes from Microsoft blue to a grey. Connection repair applications don't help. [Start|Settings|Network-Connections] . Any ideas what causes this problem, and on how torecover without restarting the machine.