[RalucaD]

Hi guys, I am Raluca, from BitDefender. I want to let you know that the
issue with Windows 64 bit OS experienced on Saturday was isolated and
the update withdrawn shortly afterwards. Very few users have been affected and we are very sorry for any problems caused.
We invite those of you who are still experiencing issues to access the
solution that can be found here:
Antivirus Support & Malware Database | BitDefender Consumer Support

However, if there are any unexpected situations, please contact our support team directly via email, chat, phone or forum:
Contact Us or just explain the issue here.

Thank you very much for your understanding!