When installing VMware.

You will get the error “Service VMware Authorization Service (VMAuthdService) failed to start.” when installing VMware (I’ve tried Player and Workstation) and have Avast installed.

Disabling Avast will not do any difference. Uninstalling Avast will work, but there is an easier solution.

In Avast click Settings and then Troubleshooting. There uncheck “Enable hardware-assisted virtualization”. After that you have to reboot your computer.