Troubleshooter of Error: Backup Fail "Access is Denied" 0x80070005

Backup Fail "Access is Denied" 0x80070005

Getting this error every time I try to run a backup to an external HDD.
 "Access is Denied" error code: 0x80070005
Dell Dimension e520
Windows 7 Home Premium
Backing up to WD Passport
I am logged in as with my account and I am an administrator.
I have full access to all hard drives and the external hard drive.
There is sufficient space on the WD Passport for an additional backup.
I did remove a number of old backups just in case.
Still get error.
Backups were running automatically every Tuesday at 6:00 AM
The last successful backup was December 31, 2013.
Windows Update downloads and installs automatically and there have been no failures.
The only Windows updates between 12/31/13 and the next scheduled backup were definition updates for Microsoft Security Essentials.
I have searched the internet and find numerous mentions of the same problem.
I have not found and thread with a clear solution.
Can someone point me in the right direction?

Thanks
Jim

Anwsers to the Problem Backup Fail "Access is Denied" 0x80070005

Download Error Fixer (Free)

Machine Throttling

• Click the Start button.
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• Look for the following registry key: "HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\ SQMClient\Windows\DisabledSessions".
• On the right window pane, delete the subkey: "Machine Throttling".
• Restart your computer.

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