I'm having a problem with my NETGEAR WGT624v3

yes set the speedstream modem to log in. it is uner advanced, usually 192.168.0.1 address. It is most likely set to "bridged" mode and using the router to login. set login to ppoe on speedstream on one p.c. only 1st. with login ang password filled in and "smart keep alive" on.

Is it the connection between the laptop/desktop and the router or it is the connection between the router and the modem that drops frequently?
If it is the connection between the laptop and the router that is dropping too often, then there is something you can do in your network setting for wireless network.
In a public network (which is usually unsecure) the connection drops frequently.
If you or only a few persons are the only user(s) of your router and your WLAN is securely encrypted, then try changing the wireless settings of your laptop to be in "private" network, which will solve your problem. The issue occurs when the type is "public".