Numeric keyboard

Toshiba c6550 numeric keybd stopped working. numlock changes it to arrows only which is correct.
numlock again changes to no arrows but 5 or zero keys do not work and other keys also do not enter numbers. I have checked 'f2 set up and can find nothing to change keyboard settings.
I tried to run windows 7 repair disk to fix what I think may be a driver problem..It does not apear to be hardware as the keys function in 'non-numlock' mode. I guess the real questions are ,, is it some key combination I did?? alt or ctrl and somethng,,, or blown driver or blown BIOS???
 
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