Did you tried this version of the Origin installer, running the installer as Admin? (Right click the installer > Run as an Administrator)
I swear, I just installed Battle.Net, GoG.com, Steam...and of course this is what gave me the biggest headache. All for one game (Mass Effect 3). Despite how much it gets said, I'll say it again. I hate you EA.
I downloaded the beta version, I installed it too. but when I want to log in there is a notification "You must be online when logging in for the first time." even though my internet is safe. is there a solution? thanks before