Don't worry about them these file are password protected and will not harm your pc.
The message that AIS generated was not "file cannot be scanned password protected" but "error:The system cannot find the path specified(3)"
I have gotten the first password protected message a number of times and have either deleted the file or put it in the exclusion list.
The error message on on Feb 27th to my recollection I had never seen before in the scan results.
It hasn't happened again and to my knowledge I did nothing to fix it so it must have fixed itself, so no biggie.