Bitdefender 2019 Free -- Protection Stopped Working, Can't Reactivate

paperjam

I've been using the free version of Bitdefender since November 2018. Suddenly, I recently noticed that my protection is inactive and my system is "at risk." When I try to activate protection, error message just says "Failed to activate protection. Please Retry." Also, I cannot do any scans, I just get the error message "Starting System Scan Failed." Progam Version is shown as 1.0.17.164. I'm running on Windows 7 Home Premium.

Windows action center also warns that Bitdefender is turned off.

Help?