Any ideas what may be causing wireless internet connection issues?

I recently moved into a room in a house with wireless internet. I have a couple devices that need a wired connection so i had to power cycle the router to give them internet access. Now, the wireless is acting up. It keeps connecting and disconnecting from the internet pretty consistently like every 30 secs to a minute. There are other wireless networks in the area and I read that they may be interferring with our network, so possibly switching the channel on the router may help (which i havent been able to try yet because my roommates cant remember the password). The router model is a wrt54g linksys. Does anyone have some suggestions or ideas about what might be going on? or perhaps something i can try without knowing the login?