I've been using a D-Link wireless modem with router and Win 7 PC. I face the following problem now. My Wireless network shows in the list of available networks during start-up, but disappears soon after. I've setup the connection so that it connects automatically to this network. Interestingly some other nearby networks are appearing in the list. I tried the following things.
1) Checked "Connect even if the network is not broadcasting its name (SSID)." in network properties.
2) Tried restarting PC, On/Off Modem etc.
3) I am able to use my wireless connection on Mobile.
Confusing thing is that it is showing other nearby networks. Any help would be greatly appreciated.