If you are having issues where the VM has the intergration tools "installed" but won't actually detect a network port or give you mouse capture and when you re install them from the disc it tells you there is a previous installation and it will unpgrade/reapair, do the follwing:
Open server manager.
Select Device Manager.
Uninstall the Virtual Machine Bus device under System Devices. It might show up with a yellow exclamation point.
Run a hardware scan.
Everything should install now.
Good luck.