Hi,
Check if the Library has iSCSI interface, if it has one you can try configuring iSCSI connectivity by following below steps:
1. Install Software iSCSI initiator inside the Virtual Machine, you can download it from microsoft site for Windows Guest OS.
2. Make sure tha VM and Tape Library both are on the same network.
3. Follow belwo KB article from Microsoft http://technet.microsoft.com/en-us/library/ee338480(WS.10).aspx
Regards