Could you let us know how exactly the wireless router fits into your network?
Is it connected this way?
Internet -> Modem -> Wireless Router -> Desktop
Or is it configured differently? Is there another router in the mix somewhere?
There shouldn't be any need to reinstall anything on the PC to get the wireless working for others. I'm assuming that a simple reboot of the router doesn't work?
My roommate bought a new wireless router, installed it on his desktop and it worked fine.
Then, when he shutdown his computer the signal cut out for the router and when the computer is turned back on the connection stays off. So far the only way to get it working again is to re-install every time. The router is still on, it's just everyone loses connection when the desktop turns off, and we can't figure out why.
He's using Windows Vista sp2 and the router is a D-Link Xtreme N Gigabit router.