UnauthorizedAccessException is caught when using office automation

[Franz]

Hi,

I have the following lines of code run in the server side of the web
service, however, it throws an UnauthorizedAccessException to me. What do I
need to do to allow the use of office automation?
Do I need to bother the Code Access Security?

Dim oPPTApp As PowerPoint.Application
oPPTApp = New PowerPoint.Application

Thanks,
Franz