post deploy scripts and registry keys

Hi,
I have a problem with registry keys and Windows 7 64bit.
If I, for example, attempts to the Keys
[-HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \ CLSID \ {645FF040-5081-101B-9F08-00AA002F954E} \ shell \ Open CCleaner ...]
[-HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \ CLSID \ {645FF040-5081-101B-9F08-00AA002F954E} \ shell \ Run CCleaner]
to delete with a script (Post-Deployment Activities), these keys are not deleted. Under a Win7 32bit it works.
When I import the keys on a reg file directly, they are also deleted as expected.
Also a batch file, the whole works.
Only if I distribute the script / reg file via DC, nothing is deleted from the registry.

( translated with Google :) )

Regards,
Thomas