Hi Sir,I am Bharath from India.I think There is a Driver problem with your Laptop.Please follow these steps
I had the same problem with my Old PC and I did this and everything started to work Perfect
NOTE-Your Wi-fi Modem must be connected and must be Switched ON
1) Download Driver Booster Free from iObit and Install them (You can make it PRO by learning in Youtube)
2) At first Open,It will automatically scan for Outdated Drivers
3) After Searching,It will show the Results and All you have to do is tap 'Update',Sit back and Enjoy some Coffee !
4) When you click 'Update',It will calculate the Size of those drivers,Download it all in One (As an Order)
5) Most Important thing - It also creates a System Restore Point before...