On a typical Windows 10 64bits installation, the two directories Bitlab uses are:



It is vital that these two directories are on the exclusion list of your Windows Defender software, and / or of your other Antivirus software.

Here is a collection of resources that will help you do that:
https://ticket.awarenesstechnologies.com/kb/a40/antivirus-identification-guide-and-exclusion-instructions-for-windows-pc.aspx
https://www.spytech-web.com/help/exclusion-instructions.shtml