Shut down all non-essential programs (especially anti-virus) before trying to start the game. The only 'cpuinf32.dll' file I have in my system is in a folder for OmniPage Pro (OCR program).
If that doesn't help try a clean reinstall, shutting down all non-essential programs after each reboot. If using Windows XP, make sure you install the game and
patch from an account with administrative privileges.