okhay i cannot give you an exact anser to ur problem!!! but here are couple of things i would try!!! if you are one of those who liek to play computer here are couple of  things you can try:

>Changed "Wireless Mode" from "802.11b/802.11g" to "802.11b".(if needed)
>try using static Ip, disable ipv6,
> try entering ur dns again!!!(use 4.2.2.2) thats like global dns server address!!! (good luck on this!!!)
>disable your dhcp broadcast!!
> update drivers!!1
>restore again!!(jhheheheh)
> get the latest patch!!!!
> download hotfix if you want!!
>or you can use your ethernet cable(hheeh)
> try changing your wireless channel!!!
>reset operating system to factory defaults(if u want ??)

and here's my best solution!!!! (if all of the above doesn't work)
> sell ur laptop in ebay or craiglists for loss lol!!!
> or save money to buy a macpro!!!! u can use parrells and vmware to install windows!!!!
> or plz install ubuntu or any linux distros!!1
 M GLAD THAT I DUMPED WINDOWS YEARS AGO!!! LOL!!!
LA BRO JPT LEKEHO RAHECHA BHANE SORRY!! RAAT BHARI KAAM GAARI AAKO!! KEHI KEHI KURA MISTAKE LEKHEKO NII HUNA SAKCHA!!!
LOL JAI NEPAL!!!! DUMP WINDOWS!!!!