thanks but the problem is that i cant access to router's configuration
because i am just a user in this appartment and i don't have that password
and i don't think anyone bought a new router because in my area only 1 wireless network exist!!
and that is the one i use(so if they had a new i could see in the list)
i am sure they changed someting in the routers setting
because for few hour i didnt had internet in no any device(even my desktop pc)
after that,it was fine in my desktop pc,bt the problem begin with my laptop
but another strange problem that i have is:
i have 2 external wireless adapter and a high gain antenna (witch i use to connect with my desktop pc)
but non of them works on my laptop!!!(they work in other devices without problem)
i also disabled the internal wifi adapter and install drivers
etc (and in device manager it is recognized and also said this device works properly)
but they doesn't work
so icant connect even with my external adapters
it is so strange for me...