If you see Windows Update Error 66A or 13EC when you try to update .NET Framework then thispost will help you fix the issue.

How to fix .NET Framework error? To fix a .NET Framework error, download and run the .NET Framework Repair Tool from Microsoft’s official website. This tool automatically diagnoses and resolves ...

This web page contains information about the Add or Remove Programs control panel entry - Microsoft .NET Framework 1.1 Hotfix (KB925168). More information can be found by visiting this search result.

There really isn't such a thing as an "unhandled error" -- if your code throws an error outside of a Try...Catch block, then your error bubbles up through various ASP.NET and .NET Framework error ...