This may help? Are you brave enough to edit your registry (having backed it up first, of course!)?
Run Registry Editor (regedit).
Navigate to the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
If you have this key already, check to see if you have a value 'StorageDevicePolicies'.
If so, and the value is 1, set its value to 0, otherwise
Create a New Key named StorageDevicePolicies.
Highlight StorageDevicePolicies, and then create a New DWORD (32-bit) Value named WriteProtect.
Double click on WriteProtect, and set its value data to 0.
Fingers crossed.
Your symptoms are sometimes caused by a virus,by the way.........................