Open a Command Prompt and type:
regsvr32 /u shmedia.dll
or to re-enable type: regsvr32 shmedia.dll
Another fix
1. Run regedit
2. Find HKEY_CLASSES_ROOTSystemFileAssociations.avishellexPropertyHandler
3. Delete the “Default” value “{87D62D94-71B3-4b9a-9489-5FE6850DC73E}”