Thanks for your response.
In fact I would like to remove the WPA protection because one of my roomate can't access to the Internet with the WPA protection. Moreover, I think this protection makes the network slow and I would prefer the WEP protection (although I know WPA is a better protection).
I ever asked PrimeTel but they told me that I CAN'T do this with their router. It's forbidden... I rent them a router and I can't change the protection ! It's a bit special ! When I rent a car, they don't tell me that I can't change the gear...

Thanks in advance if you have an idea (of course I could buy an other router but I don't really want to spend more money.)

Hello !

I have a new wireless connection with PrimeTel and I try to connect to the router (to remove the WPA protection) at http://192.168.2.1 but I don't know the login/password to log in and this is not the default one ! I suppose PrimeTel set the same login/password on each of its router and perhaps they won't give these to their customers ? Is there anyone who know these ?

I hope you will be able to help me and thank you in advance !