The problem most likely is with your router. There are apparently allot of people having the same disconnect problem as you using the WRT54G ver.6.

The link below may be of some help

http://www.dslreports.com/forum/remark,17720867

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A little common sense goes a long way

Later Grandpa

ok guys here's what happened to me. I downloaded offline version of java 6 then downloaded and installed limewire it worked perfect...I had a turbo connection for about 2 hours. I was just downloading songs and all of a sudden my internet went down, so I restarted. When i restarted limewire had somehow uninstalled itself so i reinstalled it and it hasn't worked since. I have a cable modem...help please.....

Grandpa dude if u havnt noticed everyone that runs vista cant run limewire i cant ether and i need some new music for my Ipod since im going to snowboard and no one helped my problem

I read this thread where someone contacted a Gateway rep who told them that McAfee was interfering with Vista alot! Uninstall it. I tried it, (even though I don't own a Gateway), and IT WORKED!!! LW is running flawlessly and my internet isn't hijacked anymore! Give it a try and post what you think.