Networking / DSL / Internet Problems. Please Help!

Hello,

I am desperate need of some networking help. I recently purchased a Linksys
WRT54G Wireless router to use with two desktop computers (One Windows Vista
Ultimate and One Windows XP Home) I have both desktop systems connected to
the router using wires. I have my notebook computer connected wirelessly as
well as my AppleTV unit connected wirelessly. This is why I bought the
wireless router for the notebook and Apple TV. The notebook has Windows
Vista Home Premium on it.

The problem I am having is that after booting up and doing some work on my
desktop computer and then leaving for awhile, when I come back the network
connection has dropped to limited connectivity and no internet access. Also,
the notebook and Apple TV can't connect to the internet either. I have
checked with my ISP and they have no problems reaching the DSL modem so this
indicates that I have a problem at my end. If I unplug the router and plug
it back in everything clears up and I again have internet access.

So I don't know if it is my computers that are doing something that is
causing the network to get messed up or if it is the router. I have tried to
pay attention to what my computer does when I am away and the only thing I
can think of is the power save functions. I have looked for everything I can
find dealing with power save and the network card and have turned it off. I
am waiting now to see if the problem is corrected. If it still happens I don't
know what to do. I don't know much about networking, etc.

Any suggestions? Please!

=(8)