Christmas gift from Bitdefender, the Bitdefender Antivirus Free Edition 1.0.13.859 now comes with English GUI.
Pay attention when the setup starts.
There's a window asking what language you want (RO or EN).
edit: because a lot of users have issues with the offline installer, direct download links has been removed.
Web Installer
-http://download.bitdefender.com/npd/free/Antivirus_Free_Edition.exe
English User Guide (PDF)...
Bitdefender Antivirus Free - English GUI