EAProxyInstaller not working

Do you use the default installation folder for Origin or had set up a new one? At first, please open your taskmanager and close the "EA Proxy Installer" process. Try to install the game again.

Please check the version of Origin installed on your PC. A version later than 3.x is required.

To rectify:

1. Try to run the client as administrator.
2. Go to www.origin.com/download
3. Download and install the latest version of Origin (and make sure you have your Origin account ready as well)

If that doesn't help, you can try to use the Cloud storage function from Origin or reinstall the origin client and install the latest version as mentioned in point 2. If you running on a Windows 7 64bit system, you can try to run the Client under the Windows 7 compatibility mode. The Windows 7 compatibility mode is running as x86, and helped in a few cases to solve this issue.

Please get sure that you run Origin.exe as administrator and add Origin and BF3 to the whitelist of your firewall/antivirus software.

Please let us now, if this problem after this workaround still exist.

Cheers
Basti

Find the eaproxyinstaller.exe file in origin folder and change compatibility to windows service pack 3 and run as administrator.