Open up the the registry and go to:
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Explorer/RemoteComputer/NameSpace
under that branch, select the key:
{D6277990-4C6A-11CF-8D87-00AA0060F5BF}
and delete it.
This is the key that tells Windows to search for Scheduled Tasks. You may want to export the exact branch so that you can restore it if necessary.
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Explorer/RemoteComputer/NameSpace
under that branch, select the key:
{D6277990-4C6A-11CF-8D87-00AA0060F5BF}
and delete it.
This is the key that tells Windows to search for Scheduled Tasks. You may want to export the exact branch so that you can restore it if necessary.