Can ASP.net application using framework 4.0 run on IIS 5.1, I get a CompilerVersion attribute error

I have developed an ASP.net application debuged with Visual Web Developer 2010 framework 4.0, My operating system is Windows XP. When I publish the website to IIS5.1 and run it I get an error below,

Exception Details: System.Configuration.ConfigurationErrorsException: The value for the 'compilerVersion' attribute in the provider options must be 'v4.0' or later if you are compiling for version 4.0 or later of the .NET Framework. To compile this Web application for version 3.5 or earlier of the .NET Framework, remove the 'targetFramework' attribute from the <compilation> element of the Web.config file.

I have selected framework 4.0.30319 in IIS properties. I deleted targetFramework="4.0"/  from the following web.config line,

<compilation debug="true" strict="false" explicit="true" targetFramework="4.0"/>

The application now runs, but my login controls fail. "login unsuccessful .... when using ASPNETDB.

Appreciate some expert help.
dearnessAsked:
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shanejhCommented:
You can use .net 4 with Windows XP
You can use .net 4 with IIS 5.1

You need to make sure that version 4 of the framework is installed and make sure it is select the correct version of under the asp.net tab for you application in IIS.

You may need to use the following:
c:\windows\microsoft.net\framework\v4.0.30319\aspnet_regiis.exe -iru 

Open in new window

(where version is whatever version of asp.net you installed)
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dearnessAuthor Commented:
Shanejh,
Thanks for your reply but registering aspnet_regiis did not make any difference. I still have IIS5.1 reporting as though I am trying to use an old version. I have selected version 4.0 in IIS as attached picture shows, both default web and my virtual.
I have deleted all temporary files ad re-booted as well.

version
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dearnessAuthor Commented:
I opened the C:\Inetpub\wwwroot in Visual Web Developer and upgraded it to version 4.0 framework. Now the default web page loads. But now I cant login with a valid username and password, works OK in Visual Web Developer.
Also the navigation menu is not formatted right but is OK in Visual Web Developer.
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shanejhCommented:
Yeah that looks fine then.

I don't think there is an issue with asp.net here now. If ASP.Net was unhappy any server side control would cause it to break.

Do you get any errors when you try log in? Is the .MDF present? Is it the same file used for debugging?

The menu issue sounds like a CSS/image issue, probably the site looking for files in root when they are in a sub folder.
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dearnessAuthor Commented:
I fixed the login problem by giving users full permissions to the App_Data folder, as well as ASPNET machine account. The menu I will work on now. Thanks.
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