Unexpected error occurred while updating diablo 3
If you guys are seeing a Tome error when installing then there's probably an issue with the downloaded files.
These can be incomplete if the downloader wasn't able to finish.
We've recently become aware that playing Diablo III with the latest Catalyst 12.4 drivers for ATI cards may cause some visual artifacts for specific hardware configurations.
This issue affects users of ATI Radeon HD 2400, 2600, 2900, 3400, 36 graphics cards under Windows Vista and Windows 7.
We'll also include non-Blizzard sources when appropriate (but in general, Blizzard is pretty on top of all these).
In fact, setting the tools to run in Compatibility Mode may cause other issues with the Blizzard Launcher.
If you are having issues with the game and normal troubleshooting steps have not helped, please create a thread here or you can create a Support Ticket on your Account Management page.
ATI Radeon HD 4600, 4700, 4800, 5000, 60 series products are unaffected, as is Windows XP.
Update: ATI has released a Catalyst 12.4a driver hotfix for the affected cards.You may remove the game files using the Uninstall Program features in Windows (Add/Remove programs if you are on Windows XP).