VMware Workstation install error: Service VMware Authorization Service (VMAuthdService) failed to start.

I was trying to install VMware Workstation 10 on my PC when suddenly wild message appears:

Service VMware Authorization Service (VMAuthdService) failed to start.

Verify that you have sufficient privileges to start system services.

I followed all of the official VMware guides to resolve this problem but non of them worked. After pulling my hairs for a while, the solution was to disable hardware-assisted virtualization in Avast! Antivirus. Even when you disable Avast! shield control, you are unable to install Workstation without disabling hardware-assisted virtualization or uninstalling Avast!.

Open Avast!

1. Go to Settings
2. Go to Troubleshooting
3. Uncheck Enable hardware-assisted virtualization
4. Reboot
5. Profit