Hi,

I am creating a Excel 2007 VSTO COM Add-In using VSTO 2005 SE . It runs perfectly fine when I build it and run the in development computer having VS 2005.

However, when I try to install the setup.exe or .msi file for the same addin in the client machine or Virtual PC having the following configuration:

1. VSTO Runtime

2. Office 2007

3. .NET 2.0 Framework

it does not seems to load . I also did caspol settings to make it Fully Trusted .

I get the following error " Not Loaded. A runtime error occurred during the loading of the COM Add-in."

Can someone please help me on this ?? Thanks in advance

Few tips:

1. Make sure it is VSTO Runtime that has shipped with VSTO2005SE that is installed on the machine.

2. set VSTO_SUPPRESSDISPLAYALERTS=0 to force displaying error message reporting what the problem is

Hope this helps to troubleshoot. I will close this thread, please re-activate if taking the above did not lead to resolving the problem along with post the error message.

It does'nt helps either. I did the above setting and opened excel.exe from cmd but simply no error message and no popup was displayed.

"LoadBehavior: Not Loaded. A runtime error occured during the loading of the COM Add-in" This is the only error message I see when I go to Excel-> Addin-> Com Add-in.

It has been over a week I have been struggling with the same problem and whole of my development team is facing .

Please suggest .

Did you enable the add-in? If the add-in is alreadt disabled then Office won't execute it again.

Check the value of the following registry key HKEY_CURRENT_USER\Software\Microsoft\Office\Excel\Addins\<YourAddin>\LoadBehavior

If this value is 2 - then Excel won't load the add-in. Change it to 3 and start Excel again with set VSTO_SUPPRESSDISPLAYALERTS=0