I have an Asus A43S laptop and ever since I bought it, the wireless was working fine. Then my wireless modem didn't work properly (can connect to internet via ethernet but gives a really weak wireless signal to the point that even if I connect, there will be no internet). So I bought a new D-Link Modem and the wireless works fine on my android phone but suddenly it doesn't work on my laptop. It can detect the wireless network but everytime I try to connect it says 'Unable to connect'. I don't know how to fix this. Please help.