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.
If you've pre-downloaded the digital version of the game in these languages before AM CEST ( AM GMT) on Saturday May 12, you must obtain the new downloaders to be able to install properly once the game is released on May 15.
We apologize for the inconvenience, and ask that you please let friends and acquaintances know so they can begin downloading the working installer that's now available. Obtain the new Diablo III digital downloader using the links below 2.
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.
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.
If you participated in the Diablo III beta, we recommend removing all Installation Files before attempting to install the retail client.
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.
If it's asking for a disk then it means an entire data tome is missing from the download.
I'd recommend restarting the downloader to see if you can pick that up.