If you are currently running Vista or Windows 7, please complete the instructions in the following link: Title: Windows 7 and Vista Troubleshooting Link: http://support.steampowered.com/kb_a...5688-IFHZ-2170 You may also need to manually run secondary installers required by this game. Exit Steam entirely. Browse to your Duke Nukem Forever installation folder (Usually C:\Program files\Steam\Steamapps\Common\duke nukem forever\) Run the following installers: ...\Steamapps\Common\duke nukem forever\Redist\DCO\setup.exe ...\Steamapps\Common\duke nukem forever\Redist\DirectX\dxsetup.exe ...\Steamapps\Common\duke nukem forever\Redist\VC2005\vcredist_x86.exe ...\Steamapps\Common\duke nukem forever\Redist\VC2008\vcredist_x86.exe If you are on a 64-bit operating system, you may also need to run this installer: http://www.microsoft.com/downloads/d...4-157cfdffee4e If the issues persist, please complete these guides: Title: This game is currently unavailable Link: http://support.steampowered.com/kb_a...4595-WEXN-6831 Title: Games do not run after 'Preparing to Launch' Link: http://support.steampowered.com/kb_a...6218-USFX-5568 If the issue continues, please contact the Duke Nukem Forever Support team: Title: Duke Nukem Forever Link: http://support.steampowered.com/kb_a...2285-QIOJ-8438