Error with .NET Framework

When using some program or programming your own programs with .NET Framework, maybe you will see this error:

Could not load type 'System.Security.Authentication.ExtendedProtection.Configuration.ExtendedProtectionPolicyElement' from assembly 'System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

It's cause by some update from Windows (Windows Update) that make .NET Framework stop working. When it happened, you can use the below methods to fix:
- Download Update Hotfix KB975954 here
- Check out the Solution from Microsoft here
- Uninstalling the update In Control Panel -- Add Remove Programs - it appears as
KB976769v2 under Microsoft .NET Framework 3.0 Service Pack 2

I've tried, and it work!!! If your have any question, feel free to ask me. I'll answer you as soon as possible.