dell inspiron n 5010 Windows 7 home basic login issue

I found a strange issue with my laptop. when booting, after clicking on icon to login...

1. Password gets automatically typed (I think [ is getting typed unstoppable..unless we use select all and delete.)




2. After booting in also, when we are using face book or some other application, automatically [ symbol getting typed n number of times.

I am using panda internet security 2016. This problem started when I was using kaspersky internet security 2015.

I changed the firewalls and antivirus, but this problem continues.

How can I resolve this?