I just bought a logitech wave 450 ergonomic usb keyboard. It has some media hotkeys (for home page, explorer, calculator etc) which according to logitech don't need drivers, but they don't work.
I'm on XP SP3.
The previous keyboard was an unbranded one with programmable hotkeys, which I've uninstalled. I also restored the original windows keyboard drivers kbdclass.sys and bkdhid.sys in the hope that might be the problem

any further ideas?