Download Diablo 3 Error 3003 repair tool:: http://www.reginout.net/ Follow the steps given below to fix diablo 3 error 3003 error: 1. Make sure all Minimum System Requirements are installed 2. Disable Window Mode 3. Change Preferred & Alternate DNS Servers 4. Download-Install Driver Updates 5. Prevent Graphics Card from Overheating 6. Repair Game Settings For more information:: http://naumanlodhi.blogspot.com/2011/12/diablo-3-error-3003-fix.html Solution (May 2012 and Fresh Techniques to fix the game error): Diablo 3 Error 3003 After Diablo 3 has been released so many users started encountering error 3003 on PC. It really makes you angry because you hardly get chance to play Diablo once you started receiving it. If you are among these users then don’t worry! You have come at the right place. Let’s start discussing several solutions that has already helped many users. Solutions: Delete Preferences File Update Microsoft DirectX Check Drivers for Digital Signature Check Dial-Up Internet Settings Stop Conflicting Background Processes Remove Unsupported Drivers Delete Temporary Files Delete Preferences File The file D3Prefs.txt contains settings for your Diablo 3. Some wrong values in it can crashe Diablo 3 Windows 7. Deleting this file can help troubleshoot your issue. Click Start, select My Documents. Double click Diablo III folder. Right click D3Prefs.txt file and select Delete option. Update Microsoft DirectX DirectX is a very essential software for running many games released nowadays. Diablo 3 runs fine provided that DirectX is updated on a regular basis. Visit DirectX Download Page, download the setup to your computer and run it. Follow the on screen wizard and then restart your computer. Check Drivers for Digital Signature Check all your drivers for digital signature. Use the DirectX software to do it as below: Click Start, select Run. Type DxDiag in the Open box and press ENTER. You’ll be prompted to check if your drivers are digitally signed. Click Yes. Follow the on screen instructions. Check Dial-Up Internet Settings For dial-up internet users there is a setting in Internet Explorer which can be the reason of Diablo 3 error 3003. Disable the Dial whenever a network connection is present option to resolve your problem. Open Internet Explorer. Click Tools menu and select Internet Options. In the new dialog click Connections tab. There are total three options. Make sure that the second option Dial whenever a network connection is present is not selected. If it is selected then select any option from the remaining two. Click Apply | OK. It will fix Diablo 3 Windows 7 crash on PC. Stop Conflicting Background Processes Usually when our computer is started a number of services are executed. While loading Diablo 3 there should be very less services and processes so that they won’t cause any interruption to it. Download a Services Optimizer softw