Disc tray won't open using the button

Having installed Windows 7 I now find that my Disc Tray won't open on the usual button, I have to go to My Computer and select Eject. It was working normally before the Windows 7 install. My system is Packard Bell iXtreme X2712. I have updated all the drivers and the machine says that they are all OK. your help most appreciated.

 

i am having the same problem,some times for me eject option also wont work..
so i choose a pin and insert into the pin hole so the tray opens..i done this to some what nearly 100 times..after that i get serviced to change the belt...so now it works fine with the button...so you also try changing the belt may be it works..i am having windows xp desktop pc with samsung cd writer...