Question : Site Configured for use with ASP.NET 1.1.4322.573

When I open solutíons in Visual Studio, I am presented with a message telling me that my site is configured to use ASP.NET 1.1:

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Microsoft Visual Studio
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The site 'http://localhost/WebSite' is currently configured for use with ASP.NET 1.1.4322.573. Microsoft Visual Studio has been designed for use with ASP.NET 2.0; if not configured some features may make incorrect assumptions, and pages designed with the tool may not render correctly.

Would you like the site to be configured for use with ASP.NET 2.0?
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Yes   No   Cancel   Help  
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Selecting 'Yes' makes the message dissapear, but the next time I open the same solution it is there again.

The problem appeared after migrating from XP to Vista (Clean install).

Any ideas?

Answer : Site Configured for use with ASP.NET 1.1.4322.573

Essentially - this becomes a needs must exercise.
The problem is probably caused by not installing .NET and IIS in the correct order.
You should always install IIS, then .NET (1.1+2.0+3.0), then VS2005.
That way - the registration of DLLs and web support is (should be) correct.

aspnet_regiis -i was a bit of an outside chance in any case - as this generally didn't resolve a similar issue.