ActiveX in Protected mode IE7 Vista

I am developing an activex control that launches an application. The
activex
is in the form of a dll and is packaged in a cab file. The control is
invoked from a javascript, and works when protection mode is turned off in
IE7 on Vista. However, it fails to launch the application when the
protection mode is turned on. I did try setting the registry for
HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy with
a
created GUID for the executable that is being launched from the activeX
and
try, though I am unable to overcome the issue. I am using CreateProcess to
try launching the executable.

Any examples with code, and other details would really help.