From working on a Win 7 computer recently I got that error after running a spyware clean up program. I was able to fix the problem by putting all the quarantined items back on the computer. The computer was running Microsoft Security Essentials so I believe it uses BitDefender components. That would leave all Windows 10 computers vulnerable to the same problem because Defender (Security Essentials) is built into Win 10. If that is the case and you are running Windows 10 an upgrade within Windows to the latest Windows 10 of your type should fix the problem.