DirectX

It appears that not all Windows 7 pre-installs come with the version of DirectX required to run DCU Online. Attempts to run the game from a fresh install on a new system report errors of missing dll (e.g. Xinput1_3.dll missing).

It is highly advised that you don't try and download/install the missing components from one of the many many "DLL Download Sites". Instead, please refer to the official microsoft distrobution available at

http://www.microsoft.com/download/en/details.aspx?id=8109