DVD drive turned into two cd drives

I installed ESET nod32 and sony vegas sftware frm a usb and after that there are two cd drives instead of a dvd and whenever I insert a dvd it is displayed as 2 dvd's.

I tried un-installing vegas but didn't worked.

I installed vegas into my other pc that had 2 drives, 1dvd and other cd-r

And after install, there are 4 cd-drives

You probably unimage the image file...this makes several drives sometimes , softwares such as DAEMON tools are famous for unimaging....