I am my self a kaspersky user, and have been continuously listening good things about Kaspersky Anti-Virus and Bitdefender 2015.
for 2016 version though use below steps:
Please follow the steps below which help Bitdefender determine if the computer can connect to the Bitdefender cloud server.
1. type cmd inside the Search bar from Windows, then press Enter on your keyboard. It will open Command Prompt. Type the following commands inside the black command prompt window. Press Enter after each line:
ping nimbBitdefender.bitdefender.net
ping bd.bdnc.net
Send Bitdefender the output of these 2 commands. You can capture a screen shot of the results and attach it to your reply.
2. open Internet Explorer and go to:
http://nimbBitdefender.bitdefender.net/
Capture a screenshot of the entire screen after trying to access http://nimbBitdefender.bitdefender.net/ and attach it to your reply as well.
3. Open these 2 folders:
C:\Program Files\Bitdefender\Bitdefender 2016
C:\Program Files\Bitdefender Agent
Let Bitdefender know if the file bdnc.ipv4 is located in both folders.
4. Then:
a) Download my attachment (productagentservice.logger) and place it on your Desktop.
b ) Reboot the PC in Safe Mode.
c) In Safe Mode, copy the file downloaded at step 1 inside
C:\Program Files\Bitdefender Agent
You will be asked if you want to replace the file that already exists there; choose Yes.
d) Restart the computer normally and replicate the Bitdefender 'unexpected error'.
e) While the error is on your screen, open this folder:
C:\Program Files\Bitdefender\Bitdefender 2016
Locate the file supporttool inside this folder (it has a red icon), right click on it and choose 'Run as Administrator'. Follow the on-screen instructions and check the box 'Try to reproduce the issue before submitting'. Click Next, select 'Error and Crash', click Next and after the crash occurs check the box 'I have reproduced the issue'. Click Next and wait for the progress bar to finish.
At the end, an archive will be created on your desktop (BDSP_*); send it to Bitdefender attached to your reply or upload it on a file transfer site such as www.filemail.com and reply with the download link.