Numeric Key pad gives comma

I have the new 24" iMac and the wireless keyboard, but to also use the numeric keypad for data entry, I have both keyboards working. The keypad on the USB wired keyboard works fine except when I key in a decimal point "." Instead I get a comma. Doesn't matter the application I'm using either (Safari, MS Word, Excel). This is a little frustrating, but I wonder if this is somehow related to my keyboard being an international version, where in some EU countries the comma actually functions for what Americans would use as a decimal point.

Any ideas how to change or fix this? I have tried to un-pairing the wireless keyboard, and tried to only use the wired keyboard. I also have gone into the modify keys menu from the Keyboard and Mouse preferences pane to see if there is something to reset.. but nothing seems to work.

Not dead in the water, just swimming in commas.

Christian