When I attempted to open a solution or a project in VS.net 2003, I got the error "Visual Studio.net has detected that the web server is running asp.net version 1.0..." I tried all the suggested fixes. I re-registered aspnet via the regiis utility. I registered my aspnet_isapi dll via regsvr32. I tried changing my web service extensions settings. I even deployed a physical Get_aspx_ver.aspx file. None of these fixes did the trick
If I cancelled out of converting the solution after receiving this message, I would then get an error that the projects had been moved or removed until i restarted iis. Nice.
Eventually, I gave up and decided that it wasn't important enough for this particular project to be 1.1 ready. So I deleted the solution and opened the desired project by itself. No error... Then I added the other projects back in. No ERROR? sweet. I guess
So, If you get this error when trying to open 1.0 projects in a win 2003 server with 1.1, try this silly work around. It just might work.