I have been getting this error a few times today
'bitdefender security service has encountered critical error'
It restarts successfully though but I'm not sure what caused it :S
Bitdefender Antivirus Plus 2017
Windows 7 64 bit
If I get the error again I'll post an image. I can't find any record in the log/notification thingie
ETA: Image attached
Also I was browsing IE11 and then an error came up on the browser:
Fix Connection Problems.
Then the Bitdefender errror happened
No issues with this previously just today
