Start > Run... > regedit > OK
Highlight "Computer" and right-click. Select "Export" and save the backup somewhere safe. Just double-click it if you want to reset the changes you make.
Navigate to the following registry location:
Click on StorageDevicePolicies and on the right-hand side there should be a DWORD value labelled "WriteProtect". If there isn't one, create it. Either way, make sure it has a value of 0. Double-click it to change it.
Do the same with the following two locations (creating any non-existent keys/values along the way):
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