My Airport express is working on and off...and then it stopped.

First hi everyone, this is my first post here and my first experience with a apple product(exept the few Ipod I own).

I brought a Apple Airport express a month ago to listen music on my stereo system. I have a Dell inspiron 6000 laptop and a wireless network with a linksys router(with a wpa protection).

After alot of trouble installing the Airport express to make it work with my existing network, it finally worked. But since, once every week, while opening Itunes, a window was telling me that the airport base station wasn't detected so I had to reset the Airport express and redo the setup. I did this a few time for the last weeks but yesterday it stop working. I tried to reset the Airport express, redo the configuration...it didn't work and after that my computer wasn't able to detect my wireless network so I had to reset everything.

I tought this product would be easy and friendly to use, but since my purchase, it give me nothing but trouble. Is there a cure to my problem?

BTW sorry for my bad english, I currently speak french...

If I run a ethernet cable from my router to te Airport express, would that solve my problem?(it's not ideal but I want to make this thing work!) BTW, is there a way to contact Apple about my issue? I looked everywhere on Apple website and didn't found a email adress.