what is a "VSO device" ??

It's a burning engine for burning DVDs... if you have DVD Fab or another similar DVD Ripping program, than that's the most likely cause of the device showing up in the device management.
 
VSO software developed their own alternative to the ASPI layer used to communicate with CDRW / DVDRW / HD-DVD-RW / BluRay burners. The driver used for it shows up as a device. It's nothing malicious, and if you uninstall all their software (and any third party applications using it, if there are any, not sure) it will go away as well.
 
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