devenum.dll is used by the games copy protections system - Tages.
The version of Tages that comes with the game is not compatible with 64bit Windows, so installing the
64bit version should help.
Unlike some DRM with the same issue, Tages released a 64bit patch for their driver, which you can get below...
(can't link to the actual Drivers page )
TAGES, the AAA Copy Protection System
.