Download PCFresher:: http://www.pcfresher.com/ For More Information:: http://us.battle.net/d3/en/forum/topic/4571558070 http://optimum-systems.blogspot.com/2012/04/diablo-error-3004.html Fix Diablo Error 3004:: 1. Close all active programs including D3. 2. Shut down your computer 3. Turn ON again | Tap F8 through keyboard before Windows logo 4. In Windows advanced options select Safe Mode to start your computer. 5. You may receive keyboard error, just restart your computer 6. Press F8 and enter in Safe Mode 7. Now launch D 3.