Running two different versions of ASP.NET on the same server

I just installed Orcas and was getting this error when running a performance test:

Event Type: Error Event Source: ASP.NET 2.0.50727.0 Event Category: None Event ID: 1062 Date:  5/24/2007 Time:  11:11:12 AM User:  N/A Description: It is not possible to run two different versions of ASP.NET in the same IIS process. Please use the IIS Administration Tool to reconfigure your server to run the application in a separate process. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Running aspnet_regiis -i fixed the issue.  You should be all set to run Orcas on new sites you create, but you’ll need to manually set 3.5 for that site.