connected to the network but NO internet access

i have hp laptop with win7 64bit and i get the access to the internet through a tp-link router 2 days ago i connected the pc to the router by wirless network it connected but no internet access i tried the LAN cable also no internet access and i don't think that the problem is from the router because i can access the internet from another device such as my iphone or any other laptop i PLEASE...