HKEY_CURRENT_USER\Software\Policies\Microsoft\Messenger\Client

Turn off the Windows Messenger Customer Experience Improvement Program
- HKEY_CURRENT_USER\Software\Policies\Microsoft\Messenger\Client\CEIP
Restrict Internet communication
- HKEY_CURRENT_USER\Software\Policies\Microsoft\Messenger\Client\CEIP
Do not allow Windows Messenger to be run
- HKEY_CURRENT_USER\Software\Policies\Microsoft\Messenger\Client\PreventRun
Do not automatically start Windows Messenger initially
- HKEY_CURRENT_USER\Software\Policies\Microsoft\Messenger\Client\PreventAutoRun