Please try to reinstall the virtual driver to fix the problem:
- Start » Control Panel » Device Manager (icon view) » Expand Sound, video and game controllers list » Right-click on Avnex Virtual Audio Device » Uninstall
- Manually install AV Virtual Audio Device: Right-click on a VCSD 7.0 shortcut » Choose Properties » In Shortcut tab, select Open File Location » Choose Driver folder » Right-click on drvinst.exe (32-bit OS) or _inst64.exe (64-bit OS) » Run as Administrator » Wait till the MSDOS window automatically close.