I am getting this error all the time and have to restart the service manually.
The Bitdefender Virus Shield service terminated unexpectedly. It has done this 3 time(s).
Windows 7 64 bit
Bitdefender 2013
Hi
Welcome to the forums!
Please follow the steps explained in the article below and post here the generated log file:
http://forum.bitdefender.com/index.php?showtopic=29927
If the file is too big to attach it, upload it on
http://www.sendspace.com
or
http://www.mediafire.com
and post here the download link.
If you were already asked to generate the log file, disregard the message above and just post the ticket ID.
Have a nice day!