Using the steps you describe, the ASP .NET tab is not shown. However, after re-installing ASP.NET Framework manually, default C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -i -enable, the project runs without any issue.

Using the steps you describe, the ASP .NET tab is not shown. However, after re-installing ASP.NET Framework manually, default C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe -i -enable, the project runs without any issue.

 i tried to re-installing the ASP.NET Framework like ypu mentioned, the install was a success. But the ASp .NET tab still not shown yet. 

Any answer for my problem??

What I meant in the earlier post is the ASP .NET tabs is still not shown event after installing the ASP .NET manually, however my poject will run after the installation.

The 2 article you provided is quite spot on regarding this issue. It seems there is an issue in running IIS in 32 bit mode in 64 bit OS. Articles I found during my research regarding this issue also share the same sentiment.  

If you would like to change the project's .NET Framework version, you will need to use the command line tool under this scenario, this article < ASP.NET Tab is missing in the IIS MMC in the web server running Windows XP Pro x64 Edition with .NET Framework 2.0 (WOW64) >, has detaild the steps.

I am having problems even installing the WebUI Suite on a Server 2008 R1 Box (64 bit).  I have tried all types of boxes, and have the same problem everywhere:  It tells me the ASP.NET Framework isn't installed and that v2.0 or higher is required.

I definitely have it installed -- but can't get past this

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Okay.. this is a real troublesome. As you can see at the top of the page that I suggest the answer for this problem. And now I'm trying to deploy my project again on the same OS, but on the different machine. And the it goes, the problem appears again. The browser showing a "Object reference not set to an instance of an object" message. 

And so I re-installed the OS, update the component to last version, and tried to deploy the project again. And now it gives me a different error message, "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". I'm realy confused now. Anyone got a solutuon for this issue? Thank you very much.

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We need to check and inspect your production server.

For the time being, we have to use the x32 OS. Because we have to deliver the machine by Friday. So I guess we can't use the machine for testing. But we will sure to let you know when we're testing on the x64 OS. 

Thank you for your prompt response.
Look forward to hearing from you in order to continue the investigation.

I also have this error:  Attempted to read or write protected memory. This is often an indication that other memory is corrupt

and I was able to fix it by setting Enable 32-Bit Applications=True but my question is WHY? Why do I have to run this in 32 bit mode on a 64 bit machine? Doesn't make sense...besides it is much slower than it should be. Please assist.

Were you able to resolve this issue? I am having the same issue. Now when I set the Enable32BitApplications setting = True, it works but who wants to run 32 bit stuff on a 64 bit machine right?