How do I disable F1 key?

[MichaelF]

I have Windows Virtual PC running Windows XP in windowed (not full-screen) mode.
One of the custom applications that I run in the Virtual PC makes heavy use of F1 key, however every time I press it, in addition to that program's functionality "Windows Virtual PC" help comes up as well!
Is there any way to disable the help or make it so that F1 pressed inside virtual PC does not call it ?

 

[Win7User512]

Virtual PC's Help doesn't come up when F1 is pressed in full screen mode.