Configuration :: Failed To Grant Permission To Execute. (Exception From HRESULT: 0x80131418)

I am following this link:
http://msdn.microsoft.com/en-us/library/aa701256(office.11).aspx to research on Excel project.

Everything works fine during development. When I publish to local computer IIS, I cannot open the excel file. The error is:

Could not load file or assembly 'DiagramOrder, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418)

I think it is related to Security Configuration and found this link: http://msdn.microsoft.com/en-us/library/zdc263t0(VS.80).aspx. I use step

To grant full trust to an assembly or folder on your local computer and also
To grant full trust to an assembly or folder on a network computer or mapped drive.

I also refer to
http://msdn.microsoft.com/en-us/library/9w6bd8f1(VS.80).aspx to add Msosec.dll
to have Full Trust.

After all the settings, I do restart computer. All the steps taken just cannot resolve the problem.

I am not try using caspol utility because I think it should same as what I did using UI. Correct me if I'm wrong.

Notes:
- Using ASP .NET Framework v2.0.50727 (.NET Framework 3.5 actually)
- IIS v5.1