Intel(R) Centrino(R) Advanced-N 6250 AGN ISSUE

Well,last week, i was able to connect to a wifi network with fine speed, and that night i decided to update some intel driver, then i use the auto detect&and update utility, then i updated the wireless section, which is

Intel(R) Centrino(R) Advanced-N 6250 AGN

then after i updated the wireless section, i can no longer connect to the network, every time i try, it's always identifying..... and has limited connectivity, i hve the correct password, and max bars of signal, they work fine before i update the driver. the computer im using is:

manufactuere: ASUSTeK Computer Inc.

model: ASUS notebook K52F/K62F Series

Processor: Intel Core(TM) I3 CPU M370 2.40 GHz

RAM: 4 GB

System type: 64 bit operating system, window 7 home premiun.

i have tried system restore, and checked everything, nothing worked. so yeah...im kinda frustrated...

Please help if you can, Thank You!