Hello, is the browser search bar filling up with the same letter you are typing or is it random?
You can try swapping the keyboard or updating the drivers for your existing keyboard by going to Start>Control Panel>System>Hardware>Device Manager: Select the keyboard and either double-click or right-click and go to properties, select the driver tab and choose to update the driver ( you need to be connected to the internet ).
Alternatively, you can go to the manufacturers website to look for driver updates.
Regards
Martin