During first minimizing, use ⊞ Win+Tab ↹, during second minimizing, use Alt+Tab ↹ and so on.
In main menu (before loading save) use only Alt+Tab ↹. In case of using Aueral 3D, and closing version notification on startup, don't use Alt+Tab ↹ twice at a row (to come back to the game after closing notification, and later to minimize in main menu). Don't press on the game icon in taskbar more than once at a row.
Game breaks can still occur though, but less.
Add a DEP Exception for Rayman2.exe. Sometimes reboot needed afterwards.
for using DX6 (Uplay):
if stiil doesn't work