Disable "Change The Color Scheme"?

Running Windows 7 64-bit, 8 GB RAM, Q9505 processor, Sapphire 7950...From time to time, Windows will break into a game to throw up a "Do you want to change your color scheme to improve performance?" There is no rhyme or reason to when it does it...not always the same game, not always the same programs, and sometimes it'll go for weeks and not do it at all, other times it'll do it seven or more times in one evening. When it's "on a roll," rebooting doesn't stop it from appearing. It used to have the same odd behavior with my old Asus 6870 as well.I want to permanently disable it. I have clicked "don't ask again" over and over again, which Windows ignores. I have changed the settings in the Action Center, which Windows also apparently ignores.