Hello Spank M,
1. Inside your Virtual Machine go to Start -> right click to my computer and choose Manage in the drop down menu.
2. In left panelfind Device Manager and expand DVD/CD-ROM drives right click on Virtual DVD-ROM and
choose uninstall.
3. Shutdown VM and go to configuration, remove CD/DVD-ROM 1 device from the list, click Ok and
add device back. After this start windows
4. And reinstall Parallels tools.