I got an update for Bitdefender Free. I now have
Antivirus Free Edition 1.0.13.61
Engine version: 7.77761
After this update my installation of Excel 2010 does not work anymore. Excel does not start anymore. After termination of Excel and a new attempt to start again, Excel reports difficulties with the add-ins (e.g. Power-Query by Microsoft). When I turn them off Excel runs again.
Counter-test: If I deactivate Bitdefender, I can start Excel with the add-ins.
Come on, guys. You're not serious, are you?
System: Win 10 Pro 64 bit Version 1803 build 17134.345
Office: Excel 2010 32 bit