I have and bitlocker encrypted SSD with Windows 10 installed. Today I downloaded Dr Web SS 10 from its offical website and installed. After restart and entering Bitlocker password, it went to "Preparing for Automatic Repair".
I tried to repair the boot in many ways, but unsuccessful. Then I had to disable Secure Boot to get into Windows.
I even tried disabling all Protection Component & every other setting, but my Notebook didn't boot in Secure Boot mode anyway.
I then removed Dr Web and installed another company's security suite & I was able to do Secure Boot successfully. So, the problem is, incompatibility between Dr Web Security Space 10 & Windows 10 in relation to Secure Booting with Bitlocker turned on.
[I didn't try installing Dr Web before turning on bitlocker, might work. I am not going to try it, as my drive is an SSD, so writing count matters.]