Yesterday I have installed Saboteur and everything ran fine at the 1st run, but now when i run it the 2nd time I've encountered the error about the video hardware, which obviously I've used the PCGamingWiki's tip to run it at windowed and without borders, it pretty much worked but then the worst thing happened. The game's FPS really dropped down, especially at loading screens. Reducing the core usage, turning off the shadows, disabling VSync, setting up the compatibility to Windows XP didn't work. It still has a very low fps.

EDIT: Nvm, turns out it was the Windows 10 Anniversary Upgrade that ruined it. Rollbacked the upgrade and it's running fine now.