Control Panel->Administrative Tools->Microsoft .NET Framework Configuration, right click on Runtime Security Policy, select Trust Assembly, follow the instructions...or see
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconusingnetframeworkconfigurationtooltoconfiguresecuritypolicy.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconusingnetframeworkconfigurationtooltoconfiguresecuritypolicy.asp
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