Wireless keyboard fn key on by default

Question

I just got a new HP Omni-27 desktop (Windows 7 64-bit) which comes with a KG-1162 wireless keyboard.  The problem is that the fn status of the function keys is reversed from what it should be.  As an example, the f10 key dims the display instead of sending an f10 code to the application, and fn+f10 sends an f10 code instead of dimming the display.  This makes the keyboard extremely frustrating when trying to use applications that make heavy use of function keys, like MS Office products and developer IDEs.  Another example is interactive games which require use of the function keys, but you rarely have an extra finger free to also hold down the fn key.  This is analagous to trying to use a keyboard that doesn't have a Caps Lock key, but always acts as if Caps Lock were on.  Of the several keyboards I use in the course of a day, this is the only one that acts this way.  I'd really like to find a way to fix this before I throw this keyboard out and buy one that works as it should.  Here's what I've tried and learned so far:
The very few references I've been able to find in a Google search either suggest things that don't work, or suggest it's a vendor problem.
A chat with HP technical support did not help.
I verified that a non-HP wireless keyboard tethered to a non-HP laptop running Windows 7 acts properly.
I verified that a USB keyboard plugged into my PC works properly.
My previous HP PC running Vista with a different HP wireless keyboard worked properly while it lived.
My conclusion is that the problem is likely tied to the driver for this particular model of wireless keyboard.  Can anyone help with a fix (other than throw it out and use one that works properly)?
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Answer 1

[Updated to add newer info from the keyboard manual.]
The f1 to f11 keys perform as either multimedia keys, or standard function keys. The default is multimedia.
To switch from multimedia to standard function, press the fn+esc keys simultaneously; this locks the keys to standard function. To switch back from standard function to multimedia, press the fn+esc keys simultaneously again.
Pressing the fn key simultaneously with an f1 to f11 key, performs the standard function.
Press fn+fx during system startup to use the function keys to access and utilize the BIOS functions (such as Boot Menu or System Recovery).
If the mouse and keyboard do not respond, refer to the wireless mouse and keyboard troubleshooting information located with your other product documentation.
For better mouse battery life and performance, avoid using your mouse on dark or high-gloss surface, and turn mouse power off when not in use.
Please let me know if this solves your problem! 
Although I am an HP employee, I am speaking for myself and not for HP.
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