I've recently installed Windows 7 on my Desktop computer connected to a wireless router via cable. My wireless laptop running Woindows 7 is recognised by the main computer but I cannot seem to set up my wireless XP computer. The XP computer recognises the router and connects top the internet but is invisible to both Windows 7 machines. I've changed the name so that the network name is the same

Are the Win7 machines in a Homegroup?XP can't see machines in a Homegroup.You'll have to set things up in a network without using Homegroup.

Hi, On Windows XP computer, please install the Link Layer Topology Discovery (LLTD) Responder: Link Layer Topology Discovery (LLTD) Responder (KB922120) Hope this helps. Thanks. Nicholas Li - MSFT