tried every thing, it is some problem wifi device of the laptop.
so just let me know is there any external USB connectors are available to connect laptop to the wifi router.
If its still under warranty you can get your wifi adapter replaced for free and I recommend internal wifi adapter than external ones because of mobility and if you are very much interested in external ones then reply me.
warrenty ended and if i want to replace internal adaptors
if would cost more so i am planning to purchase external USB adaptor . please let me know on this