I have installed Window 8 and then Microsoft Office Home & Business 2013 in my laptop (Samsung). When I do the typing (whatever writing on email, Word, Excel or Powerpoint), the cursor move up or down randomly. Sometimes, the words will automatically be changed to capital letter. It is so hard to finish one paragraph!

I had tried not to use wireless mouse but the problem still exists. Would anyone please help me how to solve this problem?

Many thanks