free Fusion 8.2.1 is unresponsive

(I7 4790/16gb ram/Nvidia 970 4gb/Win10) The newly install free version Fusion 8.2.1 starts up OK, but afterward every click of a mouse is very unresponsive to make it impossible to work with Fusion. It will also effect other programs to become unresponsive. I will need to restart the pc to make it work normal again. Does anyone have the same problem? Is my PC spec. too low to run Fusion? Any suggestions will be appreciated.

maybe try another video card driver

and check if any antivirus software is blocking/locking fusion. fusion starts several other process with it and needs to communicate with them. if a anitvirus/firewall is always blocking/checking this processes/connection it can lead to this unresponsive behaviour