SP1? Haven't installed it i don't think, so those people must be going out of their way to install it, just asking for trouble. Did you try compatibility mode TC?
By pure experimentation I am able to get Quake 4 to run on my Windows 7 64-bit PC (already with SP1). I simply copied (not installed) an existing installation of the game from a Windows XP PC, then runit as is (no need to fiddle with compatibility settings). Bingo - it ran.
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