Android Micromax a110 phone Internal SD card not opening in computer windows 7

Hi

When I connected my Micromax a110 to my computer, it is not opening SD card. It is showing disk as Removal DIsk and drive letter but when I click on them it ask "Please insert disk" . I get 3 disk when I connect a110 to computer, one is Micromax CD drive which comes with drivers for pc and other are just as removal disk but can't open them.

Why this is happening ?

hey, my phone is all working properly and I see all partitions opening easily in computer when I connect my phone to computer.