Acer keyboard some keys not working

Hello, frnds plz help me i am having a problem on my keyboard as it is not working.....other keys are working but these keys(uiopjklm) are not working....i tried the num key but when i pressed the num key numbers appears but when i turned it off nothing happens to the keywords.....plz help.....and also on opening the windows it works fine...but inside it creates problem.......