I just bought and installed Bitdefender Total Security 2016 and installed it. Under "anti-virus", "shield", the "on-access scanning" won't turn on. The check mark shows up for a second, then disappears.
Also, under Ransomware protection, the check mark for the "protection at boot" won't turn on at all.
I have Windows 8.1 operating system. I've Googled to try to find the answers but found nothing. Any help is greatly appreciated! Thank you.