it's a alcohol virtual drive. back in the days people use to want to uninstall Instan cd/dvd virtual drive from their software. I would tell them to uninstall the raid driver and the virtual drive from device maager, then delete all traces of it (in that case VOBID) from the registry.
vaderpro you can try just uninstalling the drive as you don't have the software anymore
a similar method is probably how you will get rid of alcohol's virtual drive. I use the drive though, So I won't have to fumble around with cd's to install program. MS word for some reason won't let you install it from a setup file from the hard drive, but you can install it from an iso file mounted on a virtual drive.