What is Bitdefender Error 100? Well, it’s an errorthat arises when the update doesn’t get downloaded or installed properly. The most probable reason for that may be the Windows Defender Firewall that might be interfering with the functioning of theBitdefenderthereby creating issues in the automatic update process of the Bitdefender security setup. In case, your system is showing the same error you can go through the various troubleshooting methods we have listed later in this article. You co...