This may be just some old router problem. Do try the usual Cnet Networking advice such as...
1. Router defaults.
3. Do not hide the SSID
I have had this problem for quite awhile now and am just addressing it. In my household we have a Netgear WGT624v2 router which is connected with a wire to a HP Media Center PC m7760n computer. The computer that is connected via a wire never has any connection problems on its own. However, once a laptop tries to connect to the wifi, after about a half hour the connection on both the wired and wireless drops. And at times it will say that there is still full signal strength, but internet does not work, and other times it will say there is no signal strength. I just went on the Netgear site and made sure all firmware, etc. was up to date, and performed a factory reset on the router. The dropping occurs when ANY computer tries to connect wirelessly. However the other main computer in the house is a MacBook Pro. Any suggestions on how to fix this problem?