Tenda router trouble

I recently bought a Tenda 54M wireless Broadband Router, model no: w541R, so I could use my iTouch in my house and no longer mooch off of friends that have wi-fi. I got it installed and working for awhile then my internet on the iTouch was having trouble. So I reset the router and it worked again. But every little bit I have to keep reseting it to stay online on the iTouch.
I did use the CD that came with it and followed the directions closely. But even after doing that a few times I couldn't avoid the random dissapearance of my internet. I noticed when I logged onto my computer this morning, I had no internet either. I had to reset the router to get it back.
I've been thinking that this is a problem between my two routers or something, I have one D-Link going to where I am now, but that connects to the Tenda. Sorry for not mentioning that at the begining.

Does anyone have any ideas? I really don't want to buy another router or spend much money.

I just had to restart the router again..to get my internet on my desktop back..

I forgot about this site, I did resolve the problem for the most part. I got rid of the D-Link router that I had and just hooked the Tenda one up as my main. Only problem I get from time to time is no internet. So I have to restart the router so it'll work again.
-Peter.