DLL Security Permission issues

[ArielF]

Hi!

I'm working on a Messenger Addin code, based on the auto-responder free code
written
by Keyvan Nayyeri available from here:

http://nayyeri.net/blog/auto-responder-add-in-for-windows-live-messenger/

I've added some code to send an incoming message to a URL, do a search there
and return
the results in html / plain text, and finally use this as the message body
of the reponse
to that message.

Well, I'm getting this error each time this code executes

Request for the permission of type
'System.Security.Permissions.SecurityPermission,
mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
failed.

I'm very frustated at this time, I googled a lot and get a bunch of stuff
like cospol,
gac, internet security level, assembly trust, Framework Configuration
Tool... and so on....
tryied everything - no luck at all

I guess you could find this topic easy and shed some light on me :)

Thanks a lot for reading

Ariel