Why is my wireless network disappearing?

-I have a very strange issue and I believe is on the computers end and not an issue with the router. What happens is my wireless network will disappear from the list of available networks, and when this occurs I am unable to access the network on three other devices (Ipod touch x2, and laptop). I am still able to see other networks in my area when this occurs. My first thought was the router, but I discovered something else that is interesting. When I log off or reset the desktop the network comes up immediately on the other devices. I also found that removing the network on the desktop under manage wireless networks fixes the issue. I watch my ipod touch and see the network come up within a second after pressing log off on the desktop. I am a fairly experienced with computer repair and actually have worked in the business, but this one has me stumped. So far I removed the wireless driver and installed the most up to date driver from the manufacturers website. I am thinking that the next step would be replacing the wireless card, or formatting the computer. I am running win 7 32 bit on this machine.