My keyboard types numbers instead of letters?

i have a lenovo laptop and on the keyboard it includes the number pad on the right hand side. i know when u press num lock it stops the numbers from coming, but since i already have a number pad my keyboard letters don't type in numbers instead. i know its confusing. on specific programs like skype and g mail.. my WHOLE keyboard types in using numbers. i don't get how to fix it,, i've tried playing around with fn - num lock. and fn - scroll key. but it won't help.