Can't see ribbon after I install it

Dear all,

I develop a ribbon in powerpoint2007 with vsto2005 C#, If I run source code
directly, then open powerpoint, I can view my ribbon, but If I package this
dll file include all the related file, and set register table

[HKEY_CURRENT_USER\Software\Microsoft\Office\PowerPoint\Addins\myribbon]
"LoadBehavior"=dword:00000003
"Manifest"="C:\myribbon1.dll.manifest"

I can see it is config success after I install my package!

But I open my powerpoint, I can't see my ribbon!
and it changes "LoadBehavior"=dword:00000002 automaticly!

then I click PowerPoint Options ->Add-Ins check my ribbon file, below
display "Load Behavior: Load at Startup"
CLose powerpoint, Set "LoadBehavior"=dword:00000003 then Open powerpoint,
I can't see my ribbon!
I click PowerPoint Options ->Add-Ins , It displays the following my
message for my ribbon file
"Load Behavior: Not loaded, A runtime error occurred during the loading of
the COM Add-in"

I already set Advanced table "Show add-in user interface errors"

Anyone tell me How to see my ribbon? What reason make me not see it in
powerpoint after I install this package?

Thanks
--
Best Regards
Steven