What is the strength of the network connection on the laptop that keeps dropping?(please check this) It could be that it has a very weak signal. Check that first anyway.
Things you could do to improve signal are to:
1) Update the drivers for the network card that keeps dropping connection.
2) Buy a new network card and install this on the laptop.
or 3) which is a rather long procedure if you have the time :
Check the settings on the router and make sure it is a G or better connection (some will state that is B and G) If it states both try changing the router to G only as I have found out on my router that it has a problem when putting both the B and G modes on.
You should be able to get into your actual routers config (depending on the make and model by typing in
http://192.168.2.1/ or http://192.168.1.1/ into your explorer bar/IE Bar.
When your inside your routers config look for Wireless > Channel and SSID. IF changing the router to G only does not boost the signal try on a different channel, mine is currently set on 12 (but remember your original channel setting just in case its worse when changing it around )
Hope this helps some, but wireless connections are really fragile due to weak signals and interference tell me how you get on with trying the above.
