Technical issues in Heroes IV.

Seriously, everyone seems to be having problems with Vista! Mine works fine. What version of Vista are you using, and is it 64-bit or 32-bit? Have you tried using compatibility modes, specifically 256 colors and disabling visual effects? What graphics card do you have? Have you tried tweaking the system? Try disabling Aero. Try disabling User Account Control and the firewall; I don't know, but they monitor executables, and maybe they're causing problems.