http://msdn.microsoft.com/library/default.asp?url=/library/en-us/msi/setup/disablemsi.asp
Platform SDK: Windows Installer
DisableMSI
If the value of this per-machine system policy is set to "2" the installer is always disabled for all applications. If this policy value is set to "1", the installer is disabled for unmanaged applications but is still enabled for managed applications.
The following table lists the possible configurations.
DisableMSI Description
Default
On Windows Server 2003 family, if the policy value is Null, absent, or any number other than 1 or 2, the Windows Installer is enabled for managed applications. Unmanaged application installs are blocked.
0 Windows Installer is enabled for all applications. All install operations are allowed.
1 The Windows Installer is disabled for unmanaged applications but is still enabled for managed applications. Non-elevated per-user installations are blocked. Per-user elevated and per-machine installs are allowed.
2 Windows Installer is always disabled for all applications. No installs are allowed including repairs, reinstalls, or on-demand installations.
Registry Key
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer
Data Type
REG_DWORD
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