kbAlertz: 889877 : BUG: The Submit button on ASP.NET pages does not work after you install the .NET Framework 1.1 Service Pack 1: "SYMPTOMS
After you install the Microsoft .NET Framework Service Pack 1, the Submit button on Microsoft ASP.NET pages may not work. You do not receive any error messages.
This problem occurs because client-side script files that are in the Web site are not synchronized with the .NET Framework 1.1. The PostBack event on client-side validation is stopped.
To resolve this problem, install the client-side scripts to the Aspnet_client subfolder of each Microsoft Internet Information Services (IIS) site folder. To do this, click Start, click Run, type the following command in the Open box, and then click OK:
If you use source control, the 'aspnet_regiis.exe �c' command might not work because script files are considered read only. If the command does not work, remove the Aspnet_client folder from source control.
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the 'Applies to' section."