How To: Backup Error 0x81000038 in Windows 7 - Worked Solution

When taking backup on external drives you may come across this error. Here are the two probable solutions:

1.remove and reconnect all drives

2.For every user on your machine,
- Login as the user
- Run -> regedit.exe
- Navigate to HKEY_CURRENT_USER\Sofware\Microsoft\Windows\CurrentVersion\Explorer\Shell  Folders
- Observe the value of Appdata and LocalAppdata.

If it has an empty value or a value of the type %Appdata%, this is the culprit. Can you verify that this is the case with your machine?

If so, the workaround is the following:
    a. Open a command prompt
    b. Type set Appdata / LocalAppdata depending on which registry entry has the 
wrong value. If Appdata is wrong, type set Appdata and if Local Appdata is wrong, type set LocalAppdata.
    c. Copy the value after the = sign. Example if the output is: APPDATA=C:\Users\John\Appdata\Roaming, copy the value C:\Users\John\Appdata\Roaming
    d. Paste the value in the wrong registry value. Either replace the %<<<>>>% value or fill the empty value.
Run backup again. It should succeed.

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