Keyboard number pad not working recently

I have a Windows network of about 15 computers.
in the last week a number of computers are not able to use the numbers on the number pad, it is like the number lock is not enabled even though it is.  
I have different keyboards, wired and wireless and both have the problem.
I have Windows 7 Pro.

Is there a recent update that caused this?
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Eric CIT Director / Project ManagerCommented:
Are you testing all of these in the same program?

In other words ... did the numeric keypad stop working only in one app? Have you tried opening Microsoft Notepad to see if it works there?
does it work with numlock off?
do ALL keys work? in word, notepad..?
ie0Author Commented:
Yes they work with numlock off.  Arrow keys work and page up down etc.  just not the numbers.  all keys work.
Testing notepad now
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Eric CIT Director / Project ManagerCommented:
More things to try:

Control Panel > Ease of Access > Change How Your Keyboard Works and make sure 'Mouse Keys' is unchecked.

If they are Logitech keyboards:  Open the SetPoint utility and make sure 'Disable Num Lock Key' is unchecked.

Reboot computer into BIOS and make sure there isn't a BIOS setting that's disabling the number pad.
i suppose when you boot such a pc to a live cd, that the keyboard works?
ie0Author Commented:
I have not booted to a live CD as this is an intermittent problem.

This issue happens in all applications.
then i suggest to install an OS on another disk, and see if it still happens

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Windows 7

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