GOT IT FIXED..!!
Battle.net Update Agent (Agent.exe) Issues
Issues with the Agent helper program may prevent Diablo III from installing or updating properly. If you notice your installation hanging at Updating Setup Files, or if you receive errors specific to Agent, try the following steps:
Bypass your router by plugging your computer's ethernet cable directly into your modem
Stop the installation process if it’s still running.
Wait for at least one minute. Ensure that Agent.exe no longer appears in the Processes tab of your Task Manager.
Restart the installation.
If that does not resolve the issue, delete the C:\ProgramData\Battle.net folder and try the installation again. The launcher will automatically rebuild this folder. If you cannot locate this folder, try these steps:
Click Start (Windows Key + Q in Windows 8)
Click Control Panel
If you are in Classic View:
Select Folder Options
Click the View tab
In Advanced Settings under Hidden files and folders, select Show hidden files, folders, and drives.
If you are in Category View:
Select Appearance and Personalization
In the Folder Options section, select Show hidden files and folders. This will bring up the Folder Options window.
Click on the View tab.
In the Advanced Settings section under Hidden files and folders, select Show hidden files, folders, and drives.
Try again to navigate to the proper folder:
Windows Vista/Windows 7/Windows 8: C:\ProgramData\Battle.net
Windows XP: Documents and Settings\All Users\Application Data
Delete the folder, then reattempt the installation.https://us.battle.net/support/en/article/diablo-iii-installation-troubleshooting-pc#secondary_logon
axennero : i have to wait around 10 minutes to finish the launcher updates...so just put on a video to kill time hahaha