Resolving "The media is write protected" error for external hard drives in Windows 7

Scenario:
- PC running Windows 7 Ultimate, 64 bit.
- External USB drive Western Digital WD10000HIU
- Error: "The media is write protected" when trying to perform a 'write' (e.g. create a new folder/file, rename file, delete or otherwise modify the file).

Solution:
(Originally mentioned with thanks here: http://www.daniweb.com/forums/thread137013.html, by user 'Paddy')

1.) Launch 'regedit'
2.) Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\StorageDevicePolicies\WriteProtect
    2.1) If the key 'StorageDevicePolicies' doesn't exist, create it
    2.2) Then create a new DWORD key under 'StorageDevicePolicies' called WriteProtect
3.) Modify value for 'WriteProtect' to 0, i.e. to turn off write protection.
4.) Reboot computer.
5.) Confirm resolution.

This worked for me.