I have installed MS Office 2007 compatibility patch. Since then, if I try to save a PowerPoint presentation to a 97-2003 presentation, I get the error, "You are attempting to save a file type that is blocked by your registry policy setting." I found MS bulletin 945799 that addresses this issue. I downloadeed and installed MS update 933669. Then I searched the registry for the Security subkey to change the restrictions but there is no security subkey in the drill -down directory which MS had listed. Do you knowwhere these resreictions might be listed in the registry?