When we typing on the Keyboard , we press a letter it produce unexpected Symbols,Sign. Also number may appear unexpected when we press on a letter on the keyboard. this mainly due to the Hardware Or The Keyboard Layout has been changed on the Operating System,Before Replacing the Keyboard Please Go through the given Solution.
Select Keyboards and Languages Under the Tab Region and Languages.
Solution for the Problem
Start > Control Panel >Region and Languages
Select Keyboards and Languages Under the Tab Region and Languages.
Click on the Change Keyboard Button, then a POPUP window appears " Text Services and Languages " Select the Input Language That suites your Keyboard . then Press OK.
If the Problem Persist Replace the Keyboard.