Diablo 3 updating
installers start running today (even though you can install the game, you can't play until midnight PST), a host of issues have cropped up.
Most of these can be solved by commonsense troubleshooting techniques, but some others are a bit more .
You may remove the game files using the Uninstall Program features in Windows (Add/Remove programs if you are on Windows XP).
After uninstalling the game, browse through your hard drive and ensure that the following folders have been deleted: C:\Program Files\Diablo III Beta or if you installed to another location, make sure the game folder is deleted.
Please check this link for more information: the Beta, several startup issues were resolved by setting the Diablo III tools to run in Compatibility Mode.
You may be able to fix this by running the downloader and pointing it to the same saved location so that it may scan and download any missing files. We became aware of an issue affecting the previously available German and EU English versions of the digital install downloader for Diablo III, which would not download all the necessary files.
When restarting the downloader, make sure to select the same download folder that you did before.
It should have the Diablo 3 installer file inside it. It will launch the installer on its own when it is done.
Whether you repair your previous install or download the entire game again, it's necessary to use this new downloader to install and play the game when it launches.
If you try running the Diablo III file and nothing appears to be happening, check to see if the Windows Service for Secondary Logon is enabled. This service being disabled may also cause the system to appear to hang during the "Updating Setup Files" portion when run.