hi ... i m using hp g62 and have a same kind of problem....
I have done the following steps to turn on/off numlock
easy and simple way
1>click the start button.
2>type ''keyboard''
3> there appears ' on screen keyboard'. open that
4>on that 'on screen keyboard' you can find a numlock button at right-bottom corner.
hope this may help you..
reply me
'salman khan.