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The answer to a similar query as posted by you is here at http://www.askiyogi.com/windows/15663.html Please follow all the steps given below:

Scenario 1: Custom libraries are unavailable:

To reset your libraries to the default libraries (Documents, Music, Pictures, and Videos), follow these steps:

1. Click Start , and then click Computer.
2. Right-click Libraries from the navigation pane on the left side of the Explorer window, and then click Restore Default Libraries.
Note This operation removes any custom libraries that are in your libraries location. You can restore these libraries when the library locations become available again.
3. Start the Backup and Restore Wizard to back up your files and data.

Scenario 2: BitLocker Drive Encryption is enabled

To disable and re-enable BitLocker Drive Encryption, follow these steps:

1. Connect the external hard disk drive to the computer. Make sure that the external hard disk drive is powered on.
2. Create a Windows 7 system repair disc. To do this, follow these steps:
a. Click Start, and then type create a system repair disc in the Start Search box.
b. In the Programs list, click Create a System Repair Disc.
c. Follow the instructions on the screen to create the disc.
Note You must have a CD or DVD burner to create a system repair disc.
3. Start an elevated command prompt. To do this, follow these steps:
. Click Start , and then type command prompt in the Start Search box.
a. In the Programs list, right-click Command Prompt, and then click Run as administrator.
4. At the elevated command prompt, type the following command, and then press ENTER:
C:\Windows\System32\REAgentC.exe /disable
5. Disconnect the external hard disk drive.
6. At the elevated command prompt, type the following command, and then press ENTER:
C:\Windows\System32\REAgentC.exe /enable


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