I've seen this in too many PCs over the years. If it is a driver or OS issue, reloading works.
However did you test with a LiveCD? I use Ubuntu off of either USB or CD (no install) to see if the hardware is good before I reload the OS.
Hi when recently tried to connect to my friends wifi network with my laptop having the psw and everything it gave me the msg "windows cant connect to network" and after his wifi network desapeared from my wifi list ....others can connect just fine and i can connect fine to other networks.
The network apears again only if i restart my pc and then again it gaves me the error
any ideas what is going on here???