The disabled writers registry value includes a value that is not a valid GUID. This will be ignored. Registry: HKEY_LOCAL_MACHINE\%1\%2 ...

The disabled writers registry value includes a value that is not a
valid GUID.  This will be ignored.

Registry:  HKEY_LOCAL_MACHINE\%1\%2
Value:     %3

User Action
Modify the invalid GUID in the registry.  An example of a valid GUID is
{DFEA1968-8C43-45B1-A298-627435BDC254}.