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Delete the Battle.net Folder
If the data in the Battle.net Folder is damaged or otherwise corrupted, it may cause an issue when you attempt to launch a game that requires Agent. Try the steps below to resolve this issue and restart the game normally:
Windows
Click Start
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.
Click OK.
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.
Click OK.
Try again to navigate to the proper folder:
Windows Vista/7: C:\ProgramData\Battle.net
Windows XP: C:\Documents and Settings\All Users\Application Data
Delete the folder, then reattempt the installation.
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