NumLocker allows you lock state of Num Lock, Caps Lock and Scroll Lock keys. You can force these keys to "Always On" and "Always Off". With NumLocker, you can prevent accidental pressing and changing state of there keys.
NumLocker will help you freeze the state of the num lock, caps lock and scroll lock keys preventing you from changing their state by accident. You can set each lock key to be "always on" or "always off" depending on your needs, this could be pretty handy if have careless fingers. NumLocker used between 4 to 5Mb of memory in my system so you shouldn't have any problem in keeping it in your system tray while you work. Available for Windows 2000/XP/Vista.
Get it at http://www.mystercrowley.com/sw_numlocker_en.php