IMPORTANT ANNOUNCEMENTS AND HOT TOPICS
Gifting of The Witcher 3: Wild Hunt temporarily unavailable (fix in progress)GOG Galaxy - troubleshooting and useful informationThe Witcher 3 predownload - frequently asked questionsNvidia code for The Witcher - common issues and solutions
CHECK ADMIN PRIVILEGES AND UAC SETTING
Please make sure that your user account has Administrator privileges and that User Account Control is disabled in your operating system. To do this, go to Start -> Control Panel -> User Accounts and Family Safety -> User Accounts -> Change User Account Control settings. Move the slider to the lowest position ("Never notify") and click OK.
Afterwards, launch the installer by right-clicking its shortcut and selecting "Run as Administrator". Each time you launch the game, you should use the “Run as Administrator” option as well, just in case.
If that doesn't help, try installing the game into a simple folder, like D:Test , to make sure that no problems are caused by Windows Virtualization technology.
DISCONNECT UNUSED, UNNECESSARY OR IN OTHER WAY UNUSUAL CONTROL DEVICES
If you're using multiple control devices (like multiple keyboards, mice etc, please disconnect (unplug) all except the ones you intend to play the game with.