Hi Andrew and a huge thank you for responding!
I have a Dell Latitude E4300 laptop - I use Windows XP
On my keyboard all the numbers are locked - if I push any key nothing happens - the keys to the right and the left of the numbers work fine but not the number keys. I can only imagine I have pushed the num lock key on but cannot find which key it is to release this function.
Hope this makes more sense!
Thanks
Debi