Hi suellen 0,
Although this is an earlier article, this may have the solution:
Specifically the section:
My keyboard's numeric keypad does not work in Windows.
Press the Num Lock key to enable the numeric keypad in Windows. If your keyboard doesn't have a key labelled Num Lock, try the Clear key.
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I did try the Num lock but nothing worked.
However i connected a Windows dase keyboard with numeric keys. once it had installed it's self all the keys worked fine on the Windows Keyboard.
I then disconnected the windows keyboard and re-connected the Apple numeric keyboard and It worked. I am not sure what happened but the Apple keyboard works fine now.
Perhaps it had something to do with the Windows drivers for the Windows keyboard.
Really i have no idea, but it works now.