I installed it and get this message when i try to launch:
OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD Unknown processor @ 2011 MHz with 2046MB RAM
Video: NVIDIA GeForce 8800 GTS (8585)
Failed to enter Entry: Can't find file 'Entry'
History: UGameEngine::Init <- InitEngine <- FMallocWindows::Free <- FMallocWindows::Free
I deleted the folder manually before installing. WTF
Check the startup command for the game. Entry most likely crept into it.
Open steam -> Games -> Right click DH and you should either in properties or there find some place where you can change the startup command.