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I lost permission to access my own files/folders

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hoping someone has some knowledge to impart on me.  I have an external drive WD mybook, probably 4 or 5 years old.  I've had it plugged into my pc the entire time never on any other machine.  last night I tried to view some old pictures and videos and I had a prompt tell me I don't have permission to access the files.  Also, prompted me to access the account settings to make changes.  as far as I can see all the users listed have full access to everything, so there is nothing to adjust.  I do see that an odd account is listed - Account Unknown S-1-5-21...  I ran bitdefender to scan the hard drive and it does so, however comes back with a long  list of password protected files it could not scan.  I never used a password to protect any files which makes me believe there may be an infection that caused this.  I can manually find some of the password protected files and I can delete them but there are also a few that I can not delete because, again I do not have permission.  from the same password protected files that could not be scanned, there are files, such as ($Recycle.bin-S-1-5-21...) that I can not track down at all.  

I went on the remove the hard drive from my pc and plugged it into a MacBook, to my surprise I was able to view all of the same pictures and videos the PC would not give me access to so I don' think the hard drive itself has any issues.  I feel like something has dug into my pc and hidden itself in these password protected files.


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Reason: Lack of Response

PM either Kevin, Elise, or Arthur to have this thread reopened.

The procedures contained in this thread are for this user and this user only. Attempting to use the instructions in this thread on a system, other than the one they were written for, could result in damaging the Operating System beyond repair. Do Not use any of the tools mentioned in this thread without the supervision of a Malware Removal Specialist.

All posters requesting Malware Removal assistance are required to follow all procedures in the thread titled START HERE if you don't we are just going to send you back to this thread

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