PLEASE FOLLOW THESE TROUBLESHOOTING STEPS:
1) Please make sure that you use "Run as Administrator" to install and to start the game (right-click on the shortcut or setup file and select "Run as Administrator").
Please note: This doesn’t apply if you are running the game via GOG GALAXY.
2) Please add the GOG GALAXY folders:
C:\Program Files (x86)\GOG GALAXY
to your security software exceptions list. If the game is installed outside of GOG GALAXY folder, then please add game's installation folder to security software exceptions list as well. After that please select the game in GOG GALAXY, click on Customize -> Manage Installation -> Show Folder
If you are not using GOG GALAXY, then please add the game's installation folder to your antivirus/firewall software exception/trusted list, and then reinstall the game to the same folder.
Please be aware, that simply disabling firewall or AV software could not be enough, since some of these software are running still in background or in services list.
3) Please make sure that your Windows user have full control over the game installation folder, as well as the game save folder. To do this please follow these steps:
I) Right-click the folder that you want to take ownership of, then click Properties.
II) Go to Security -> Edit
III) Press Add… and in the name field write your Windows user name. Click on Check Names (watch out for any typos!). Windows will propose path in the format of: COMPUTER-NAME\YOUR-USER-NAME
For example: COMPUTER\JOHN
IV) Please check the proposed path name and if it's correct, then click on the Ok button.
V) This will add your user to the list. Under Permissions for YOUR-USERNAME select Full control - Allow
VI) Press Ok, to save changes in Permissions Settings, and Ok to leave Properties
Some games might be using additional config or save folders. Make sure to also take full control over these folders.