My DBO Launcher wont launch , Why ?

Redownload DBO and install as if its bran new

Or open a command prompt in Windows and type in "ipconfig /flushdns" And redownload all patches and it will fix it.

um... its not working

Only reinstalling won't fix your problem ^^
Follow this Guide I made :D Hopefully it will help you

http://dbocom.com/forum/showthread.php?t=21770

Skip the launcher by accessing the core file (probably in ProgramFilesx86) and using the DBO.exe app.

If you plan on re-installing, just uninstall as you would any other program. Then search your OS (:C) for DBO and delete all the files that appear.