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Unmanaged dll call error from IIS asp.net site

Im trying to use an unmanaged C dll from a ASP.NET 2.0 web application
using p/Invoke platform (dllImport attribute). The asp.net page instances a
c# library and this loads the C dll.
Ive used this dll from a windows application without problems.  But if this
dll is invoked from a Web site it always return this error:
Attempted to read or write protected memory. This is often an indication
that other memory is corrupt
When I use it from a web project using the web server of Visual Studio 2005
Environment it runs fine, but I cant use it in a IIS Web. It is not a
programming error, all methods invoked returns this error when are called
from IIS Web site.
What do I have to configure to allow my web site to call unmanaged dlls?
I really need help.
Thanks a lot.
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