Missing ASP.NET Tab on IIS Manager Solution

I encountered a problem of ASP.NET tab is missing on IIS Manager after I installed some programs. I am using Windows XP SP2. After googling for a while, I found a solution that worked for me:

 

Note: You need to be logged in with Administrator privilege to do this.

1. Stop the IIS Admin service and any services that depend on it.
2. Open C:\WINDOWS\system32\inetsrv\MetaBase.xml in notepad or your favorite XML Editor.
3. Delete the line that reads Enable32BitAppOnWin64='TRUE'
4. Start IIS via Windows | Start | Run | iisreset

I also found a nice tool called ASP.NET Version switcher by Denis Bauer. Click here for more details.

 

There is also an additional reading about running different versions of .NET Framework on a 64-Bit machine. Part of the article says:

PROBLEM DESCRIPTION
===================
On a Windows 2003 64bit machine with both .NET Framework 1.1 and 2.0 installed, you are tying to configure a website on IIS, but you are unable to find the tab to specify ASP.NET settings.

SUMMARY of TROUBLESHOOTING
==========================
Researched turned out this being a bug that is closed as "won't fix".

Click here for the link to blog article on MSDN Blog.