Some keyboard are not properly work in my lenovo laptop

Hello,

There are problem in my lenovo laptop kayboard.
Some keys are not work properly i.e. 'w' 's' 'x'
Function keys are also not work properly when i press fn+volume arrows and fn+brightness arrow keys.
Sometime i press any key then it is terminated with dialog box to internet explorer or chrome and repeat in search many time and i can't close this, it is open itself.
Please fix my problem with solution.