Errors in Plesk for Windows log: Unable to assign process to job object: (5) Access is denied

Symptoms

Errors in Event Viewer > Plesk log:

CONFIG_TEXT: Unable to assign process to job object: (5) Access is denied.

at Start spamd service(SpamdQueue::startSpamd line 351)
Execute file name: C:\Program Files (x86)\Plesk\admin\bin\plesksrv.exe

OR

CONFIG_TEXT: Access is denied. (COM Error 80070005)
at AntivirusFilter::Execute
at (AntivirusFilter::execute line 198)
Execute file name: C:\Program Files (x86)\Plesk\admin\bin\plesksrv.exe

Cause

Corrupted permissions on Plesk files.

Resolution

1. Log in to Plesk via RDP
2. Open and run Plesk Reconfigurator > Repair Plesk installation > Plesk file security