Getting errors after upgrading to NAnt .90 - Any ideas?

I upgraded to NAnt .90 and modified the NAnt.Exe.Config to support  .NET
Framework 4.  Installed the latest Windows SDK.  I don't understand why
my script is calling the LoadTasks when they are not even in the script.
Anyone know how to fix these errors?

I'm running Nant on a simple script to send me a test email, but I'm
getting the errors below:

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://nant.sf.net/release/0.90/nant.xsd" name="Main
Build" default="Test">
  <target name="Test">
    <mail
      from="[email protected]"
      tolist="[email protected];"
      subject="Successful Email Test from Build machine using Nant 0.90"
      mailhost="<my smtp server>"      
    />
  </target>
</project>

================= Errors ===============================================

C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin>nant -buildfile:testmail.xml
NAnt 0.90 (Build 0.90.3780.0; release; 5/8/2010)
Copyright (C) 2001-2010 Gerry Shaw
http://nant.sourceforge.net

[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.CompressionTasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspa
ces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.CompressionTasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)
[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.DotNetTasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspaces\A
HLTA\3.7.0\Build\nAnt\bin\NAnt.DotNetTasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)
[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.NUnit1Tasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspaces\A
HLTA\3.7.0\Build\nAnt\bin\NAnt.NUnit1Tasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)
[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.NUnit2Tasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspaces\A
HLTA\3.7.0\Build\nAnt\bin\NAnt.NUnit2Tasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)
[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.VisualCppTasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspace
s\AHLTA\3.7.0\Build\nAnt\bin\NAnt.VisualCppTasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)
[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.VSNetTasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspaces\AH
LTA\3.7.0\Build\nAnt\bin\NAnt.VSNetTasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)
[loadtasks] Failure scanning
"C:\Workspaces\AHLTA\3.7.0\Build\nAnt\bin\NAnt.Win32Tasks.dll" for
extensions. Could not load file or assembly 'file:///C:\Workspaces\AH
LTA\3.7.0\Build\nAnt\bin\NAnt.Win32Tasks.dll' or one of its
dependencies. Operation is not supported. (Exception from HRESULT:
0x80131515)

BUILD FAILED

Failed to initialize the 'Microsoft .NET Framework 4.0' (net-4.0) target
framework.

    Invalid element <readregistry>. Unknown task or datatype.

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