Folder/File Decryption in Windows 8.1

Hello,
I have a folder with some files in it, and two sub-directories also with files in them, that I encrypted some time ago, but after I've been updated to Windows 8.1.
Suddenly, even though there is only one account on this computer (administrator), it will not allow me to decrypt the folder (and/or subfolders or individual files). When I Right-Click->Properties->Advanced...->UNCHECK Encrypt Contents to secure
data-> OK->Apply, first I get a 'Access Denied' 'You will need to provide administrator permission to change these attributes. Click Continue to complete this operation.' Click Continue and get: 'An error occurred applying attributes to the file: C:\Blah.jpg
Access is Denied' and then the option to Ignore/Try Again (Same Result)/Cancel.
The only thing I can think is, randomly about a month ago, my password stopped working to sign in on my computer (strange right?). I then had to reset it online in order to get back into my computer. I haven't needed these files since before then. Could
the fact that I encrypted them with a different original password matter here?
Here's what I've tried:
Verified that under Security All users have full access (there is only me after all).
Clicked on 'Advanced'
Checked all permissions for full access.
Added HomeUsers to that folder with full access.
Added Everyone in the Share Tab.
Added my username to the Audit tab.
Added my username to the Effective User tab.
Everything says I have full control..in fact ANYONE on this computer has full control..yet all I get upon opening is 'Access Denied. You do not have permissions to view this file'.
Any thoughts?
V/R,
Larry

Larry,
The reason that you’re receiving the “Access Denied” error is because your system is unable to find the encryption key and related certificate that were used to originally encrypt the files.
The
Recover encrypted files or folders webpage states:
“You can lose access to encrypted files if you install a new operating system or upgrade your current one, or if your current operating system fails.”You must have a backup copy of your encryption key and related certificate on a disc or other
removable media (such as a USB flash drive)
If you were able to back up your encryption key and certificate before upgrading to Windows 8.1, follow these steps to regain access:
Right-click on the start button and select Run.You must      have a backup copy of your encryption key and related certificate on a      disc or other removable media (such as a USB flash drive) to
follow the      steps below.
Type in certmgr.msc and press Enter.
In the left pane, click Personal.
Click the Action menu, point to All Tasks, and then click
Import. This opens the Certificate Import wizard.
Click Next.
Type the location of the file that contains the certificate, or click
Browse and navigate to the file's location, click Open, and then click
Next.
If you have navigated to the right location but don't see the certificate you are importing, then, in the list next to the
File name box, click Personal Information Exchange.
Type the password, select the Mark this key as exportable check box, and then click
Next.
Click Place all certificates in the following store, confirm that the
Personal store is indicated, click Next, and then click
Finish.
Note: Do not enable strong private key protection.
After you import the certificate, you should have access to the encrypted files.
Mike
Windows Outreach Team – IT Pro

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