How to Fix Problem - MS Comfort Curve Keyboard 2000 v1.0: "Down Arrow" Key releases when "Left Arrow" Key is pressed?

MS Comfort Curve Keyboard 2000 v1.0: "Down Arrow" Key releases when "Left Arrow" Key is pressed

I've had this keyboard for several years and it works great, but there's been one annoying issue with it that I've never been able to solve.
My 'down' arrow key stops working whenever I press the 'left' arrow key.  If I'm holding the 'left' arrow key down, then press the 'down' arrow key, it doesn't do anything either. 

It isn't a problem except for when I'm using the arrow keys to move an avatar  in a game (shooters in particular).  This doesn't happen to the arrow keys on the numpad, only the the main arrow keys.  For a game example, I'm able to move in all directions except
diagonal-left-down, and I can't swap from 'left' to 'down' without a full release of 'left'. 

I've even coded an example program to print text that the down-key is being released using a keyReleased() event.  This triggers when I PRESS the left arrow key and also when I actually release the down arrow key.  So If I press down key, then left key, then
release down key, I get it twice in a row, but if I press the left key alone, it doesn't print the text, and if I press and release the down key while holding the left key it ALSO doesn't print.  So the down arrow key is completely overridden by the left arrow
key.

What the heck!?  I've got the latest drivers, so is it hardware instead?  This isn't a new problem so I don't think it's dirt either (especially since it's spill resistant), but I'm not sure what I can do about it at this point.

Solutions to the Problem MS Comfort Curve Keyboard 2000 v1.0: "Down Arrow" Key releases when "Left Arrow" Key is pressed

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Hi,
Have you tried completely uninstalling the drivers then downloading and installing the correct drivers from the manufacturer's website?
You may refer the link mentioned below to do the same:
Troubleshoot wired keyboards that don't respond or that type wrong characters
http://support.microsoft.com/kb/258826

Manually editing the Windows registry

Manually editing the Windows registry to remove invalid MACHINE_CHECK_EXCEPTION keys is not recommended unless you are PC service professional. Incorrectly editing your registry can stop your PC from functioning and create irreversible damage to your operating system. In fact, one misplaced comma can prevent your PC from booting entirely!

Caution: Unless you an advanced PC user, we DO NOT recommend editing the Windows registry manually. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. We do not guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

To manually repair your Windows registry, first you need to create a backup by exporting a portion of the registry related to MACHINE_CHECK_EXCEPTION (eg. Windows Operating System):

• Click the Start button.
• Type "command" in the search box... DO NOT hit ENTER yet!
• While holding CTRL-Shift on your keyboard, hit ENTER.
• You will be prompted with a permission dialog box.
• Click Yes.
• A black box will open with a blinking cursor.
• Type "regedit" and hit ENTER.
• In the Registry Editor, select the Error 0x9C-related key (eg. Windows Operating System) you want to back up.
• From the File menu, choose Export.
• In the Save In list, select the folder where you want to save the Windows Operating System backup key.
• In the File Name box, type a name for your backup file, such as "Windows Operating System Backup".
• In the Export Range box, be sure that "Selected branch" is selected.
• Click Save.
• The file is then saved with a .reg file extension.
• You now have a backup of your MACHINE_CHECK_EXCEPTION-related registry entry.

Another Safe way to Repair the Problem: MS Comfort Curve Keyboard 2000 v1.0: "Down Arrow" Key releases when "Left Arrow" Key is pressed:

 

 

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