Vista - DVD drive problem

I have an unusual problem with Vista. First of all it won't allow me to
eject discs from my DVD-R drives unless I go to Explorer, right-click
the drive icon and select eject from the menu. After doing this if I
insert a dvd it still shows up as the previous disc in Explorer. For
instance one DVD is a game (Pro Evolution Soccer 6) when I eject this
and insert a movie DVD Vista (and all my programs) still sees the game
and won't play the DVD. Any ideas? I have two internal burners, an
Optiarc (NEC) Ad-7170A, LG HL-DT-St DVDRAM GSA-H42N. I also have an
External Philips SPD3100L. The problem seems mainly to affect the LG
and the Philips. Also I have Autoplay turned on, but nothing autoplays..

Mossie