D3 and admin rights

[traen]

you'll hardly install any software without an admin privileged account.

This limitation is artificial and is just a good example of bad application architecture.
You really don't need to install software as long as it's not installing drivers, services, virtual printers and similar stuff. Some of the registry changes may require administrator permissions as well, for example changing file extensions behaviour.

But games don't do anything like this. All they need is write access to user folder to keep config and save files. In rare occasions they need write access to the game folder to update the game data files. But that's pretty much it.

While the game looks cool and complicated in the end of the day all you get from it is changing few bytes in your save file. Basically it's just a notepad with overcomplicated and counter-intuitive interface

[Butler to Baby Sloths]

This limitation is artificial and is just a good example of bad application architecture.
You really don't need to install software as long as it's not installing drivers, services, virtual printers and similar stuff. Some of the registry changes may require administrator permissions as well, for example changing file extensions behaviour.

But games don't do anything like this. All they need is write access to user folder to keep config and save files. In rare occasions they need write access to the game folder to update the game data files. But that's pretty much it.

While the game looks cool and complicated in the end of the day all you get from it is changing few bytes in your save file. Basically it's just a notepad with overcomplicated and counter-intuitive interface

Programs cannot change the state of files on the system partition without being given Administrator level permissions or being signed as trustworthy (like microsoft office software). This is done to help prevent accidentally downloaded or malicious software from breaking your computer. If you don't like it, you can always disable UAC (well, anybody but the OP of course as he/she doesn't have the privileges to change that setting).

[traen]

Programs cannot change the state of files on the system partition without being given Administrator level permissions or being signed as trustworthy (like microsoft office software). This is done to help prevent accidentally downloaded or malicious software from breaking your computer. If you don't like it, you can always disable UAC (well, anybody but the OP of course as he/she doesn't have the privileges to change that setting).

The last time I checked d3 installer was signed

[Starflower]

If you have access to the command line you can try starting the game from there with -launch added as a parameter.
If you don't have access to the commandline you can try creating a link to your diablo III.exe, edit it's properties and add the - launch parameter there (example: "C:\Diablo III\Diablo III.exe" -launch).

You're the God. it worked. Thank you a lot