Look into the driver settings of the keyboard.
Even take a peek in the BIOS, maybe there is something related (although this is very remotely though, but with Compaq you never know
)
PS: google google google google ... aaaaaaaalways google
http://forums.windrivers.com/vb/showthread.php?mode=hybrid&t=31225
and/or
http://h10025.www1.hp.com/ewfrf/wc/genericDocumen...596&dlc=en&lang=en
Search Compaq site for more info like this. Heck even contact Compaq (also, the product/type number of the PC you're using is something to search for)