Sees network, can't load pages!

Hey, I'm having trouble with my wireless network. I have a PC wired to a router, and a new macbook 2.16ghz connected wirelessely. I've been on the internet with this set-up from my macbook many times. Lately, my macbook says it's connected to my network with full signal strength but anytime I try to load up a page, it says 'problem loading page' as if there is no connection there. I can get it to work if I crawl under my desk and unplug the router and plug it back in...then I turn off mac's airport, turn it back on and voila, it works! Then a day or two later, the same thing happens. Anybody have some suggestions as to how I could fix this? I'm good on PC's but new to Mac so I don't really know how to troubleshoot anything on it!
Thanks for the help!
-bryan

Meant to mention this...

The only thing that I can think of that's changed lately is my cordless phone. I previously had a 2.4ghz cordless phone that would interrupt and cut off my wireless internet connection. I just got new Dect 6.0 phones that are supposed to have less interference then the older types of cordless phones. Thanks for the help!