hi guys, here's wut happens

Im running windows 2000 prof

whenever I try to access my cd-rom, there's a pop up message saying "M\: is not accessible. invalid function."

wut the hell is that? I never seen this message before.. someone please tell me how to solve this problem.. whether I have a cd inside the cd-rom driver or not.. it always come up with the same message I mentioned earlier.

my cd-rw however is still working.
I tried reinstalling both drivers for my cd-rom and cd-rw.. doesnt work..

there's a hardware resources sharing conflict on IRQ 10, a pci to usb universal host controller and my sound card both using IRQ 10.. please tell me how to change these numbers..