New router network problems

[smartkid]

Ok at my house i have 3 desktops in the same room, and 1 laptop. I just got a netgear wireless router,i set it up and hooked everything up, i used the workgroup name Mshome, the wireless networks encripted, with a WIP password i think.

anyway on the laptop and one of the destops i see three computers. but one computer wont show up, all it sees is itsself, which doesent make sense becuse its the best pc of them all. I thinkl iv messed up some setting, becuse not ven the router sees it.

anyone know what iv done?

thanx,
smartkid