Weird Keyboard problems

Here's what MS suggests: "The keys do not strike correctly
If the keys do not strike correctly, make sure that the keyboard is free of dust, dirt, and foreign matter.

Turn the keyboard upside down to allow for any foreign debris, such as hair, food particles, or dust, to fall out.

We recommend that you periodically use compressed air to blow dust out of the hard-to-clean crevices in the keyboard.

If you spill a drink or some other liquid on the keyboard, immediately turn the keyboard upside down to let the liquid drain out, and then remove as much liquid as possible. Wait until the keyboard is completely dry before you use it again.

Do not take the keyboard apart. If you disassemble the keyboard, you may void the manufacturer warranty.

Note If you want to use a vacuum cleaner around the keyboard, make sure that the vacuum cleaner is a "static safe" vacuum cleaner.
The wrong characters are typed
If the wrong characters are typed when you use the keyboard, follow the steps in the "The Keys Do Not Strike Correctly" section to clean the keyboard that are described under "The Keys Do Not Strike Correctly" earlier to make sure that no obstructions under the keys are causing this issue.

If the issue continues to occur, connect the keyboard to a different computer. If the keyboard functions correctly on a different computer, the port to which the keyboard was connected on the original computer may be damaged. If this is the case, contact your computer manufacturer to ask about how to repair or replace the damaged port.

If the keyboard does not function correctly on another computer, the keyboard may be defective. If this is the case, and the warranty on the keyboard is still valid, you can exchange the defective keyboard for a new keyboard.

To test key response on the keyboard, use Microsoft Keyboard Diagnostics (MS Key), a utility program that is included with the Microsoft IntelliType software. To use MS Key, follow these steps.

Note
The MS Key utility is only included with the Microsoft IntelliType software version 1.1 and later versions. If you do not have Microsoft IntelliType installed, you can visit the following Microsoft Web site to install this software:
http://www.microsoft.com/hardware/download/download.aspx?category=MK

1.Start Microsoft Keyboard Diagnostics. To do this, use one of the following methods:◦In Windows Vista or Windows 7: a.Click Start

Start button, click All Programs, click Accessories, and then click Run.
b.In the Open box, type mskey, and then click OK.

◦In Windows XP:a.Click Start, click Run, type mskey in the Open box, and then click OK.


2.Press various keys to verify that the pressed keys match the keys identified in the MS Key window.
3.When you are finished, click Exit.

If you get no response in MS Key from your keyboard, test the keyboard on a different computer. If the keyboard does not work on another computer, see the "References" section for information about how to contact Microsoft Supplemental parts to obtain a replacement."
Found here http://support.microsoft.com/kb/258826
There is one other thing you might try but since MS frowns highly upon it, I'll hold off to see if the above helps before going there