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Running multiple security solutions on the same PC may affect their proper functionality as they compete for access to the same system resources. Even if they are turned off, there are some active processes running in the background.
We recommend you to uninstall other security solutions in order for Bitdefender to work properly.
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This post I placed for those who have trouble with nostalgia.
You're right, this quote above was written by Christian(one of the many) , he was once a part of this forum and now I have a great desire to prevent all members from this forum to forget about him.
He is a fantastic guy who always solved all types of problems given by members.
I'm sure he is thinking of us every day, eager to join us, but he still has to wait your big comeback.
Due to large number of resolved issues his computer didn´t survive and unfortunately difficult had broken down.
Now he must return his computer from the repair and then all will be as before. 
This was the main reason for his absence..... sincerely 
Christian, you have solid alibi from me and now had been created all the conditions for your faster comeback.
Sooooooo, what will you do? 