Does your computer meet the system requirements for the game? I have it on my Windows 10 computer, but mine is a download from GOG.
Minimum requirements:
OS: Windows XP/Vista/7
Graphics: Nvidia GeForce 8800 GTS 512 MB or Radeon HD 3850 512 MB (finding a graphics card performance hierarchy chart online and comparing one’s video card with our minimum is suggested)
Processor: Core 2 Duo 2.2 GHz or dual core AMD 2.5 GHz
RAM: 1 GB Windows XP, 2 GB Windows Vista/7
Hard Drive: 23 GB (The Witcher 2 Enhanced Edition)
Recommended requirements:
OS: Windows XP/Vista/7
Processor: Quad Core Intel or AMD
RAM: 3 GB Windows XP, 4 GB Windows Vista/7
Graphics: Nvidia GeForce 260 1 GB or HD 4850 1 GB
Hard Drive: 23 GB
I also found this on the CDProjekt Red Witcher 2 page.
http://en.cdprojektred.com/support/system-requirements-windows-witcher-2/It appears the CD version does have DRM which Windows 10 might be blocking. Supposedly if you patch the game, it removes the DRM. Not sure if this is the right one, but I did find this.
https://www.gamepressure.com/download.asp?ID=39449