And it was because the owner had installed some keybaord driver. Another time but not witnessed by me was they installed some OS other than from the restore media.
BTW, that is proper for a normal laptop keyboard and I hope you looked at the keyboard options in the control panel. I'm sorry but I may have skipped that since it's a basic windows skill.
I have a HP DV9720us laptop running Windows Vista. This particular model has a 17" screen and full keyboard with number pad (one of the reasons I bought it). My problem is when the num lock is cycled it causes half of the keyboard to become a number pad, j=1,k=2 etc. and I can't type words without turning off num lock. I have tried the Fn+F11, Fn+Ctrl/Alt/Shift etc., no combo works. I have also unistalled the drivers and rebooted. I have even enabled my device manager to show hidden/old drivers and deleted every driver in the keyboard and mouse dropdowns. I did this because I have used a USB wireless mouse and keyboard, although I rarely use the keyboard. When I do use the keyboard, the numlock works correctly and also fixes the laptop keyboard, until I press the num lock key on the laptop. I have flashed the BIOS, and there are no settings for num lock in the BIOS. I have run all of my anti-virus and spyware programs and have come up clean.
The computer will boot normally and I can use the keyboard fine, until I hit num lock, usually on accident because it's close to backspace. Other than being annoying, the keyboard and computer work fine. I'm not sure what else to try. Please help!!!