when I start bf3 I get application error: igoproxy64.exe- Application error.
this application was unable to start correctly (0xc000007b). click ok to close application
There are some Antivirus's that will catch this & report it, it's a false postive, try to add it to your AV safe (whitelist, or exclusions) list.
You can also try uninstalling Origin and downloading it from here: Download Origin
Of course, if you have plugin's, you'll probably need to uninstall/reinstall those too...
I have seen a few people that found the Igoproxy64.exe file and simply changed it to Igoproxy65.exe and that worked...