Heroes 3 issues under XP or Vista.

Effectiveness: 99% - remove everything related to the heroes. Disable SP2. Reinstall the licensed disc. Everything will work 99% of the time. The remaining 1% is due to the computer configuration: integrated graphics cards. Either sound or video. This is more difficult to fix. Regarding screen resolution, I used the third installment of the game on monitors with various resolutions. Both 4:3 and 16:9. My experience has shown the following: if the computer doesn't have any "extras" like accelerators, optimizers, etc., and has a decent amount of RAM (not older than 98, except for Millennium), and the disc is licensed, everything will run flawlessly. Using unlicensed versions starts to cause glitches and issues.