Wireless problems

Ok, here's what's goin on....MY laptop has wireless networking, it runs fine and every thing...but i have a problem though...See when my laptop is on for a certain amount of time my laptop will keep sending and recieveing data from the wireless network, like it's supposed to...However, once that certain amount of time is up i can't get on the internet, like i click on the internet and it'll say Page cannot be displayed, but my limewire will still be able to download...The only way i can get my internet working right again is to restart my laptop, and i want to know if there's an easier way?