Keybord problem

my acer aspire one writes in number. but when i press windows button it works. the numbers dont write what its supposed to for example if i press 2 it writes whats in the pattern of 1234567890. but as i said it works with windows (start) button. i have to press fn key in order to write u,i,o,j,k,l,;,m, ' , (,). please help me
thanks