Edit and Continue (Cannot currently modify this text in the editor. It is read only)

In Visual Studio 20080 SP 1, Edit and Continue Does not work for code behind files in ASP.NET applications .NET framework 3.5. Code files get automatically locked on building the application and remain locked for the duration of the build, returning a "Cannot currently modify this text in the editor. It is read only" error message as indicated below.

I have tried all the following suggestions in the below methods to fix it.
http://msdn.microsoft.com/en-us/library/ba77s56w.aspx
http://social.msdn.microsoft.com/forums/en-US/vbide/thread/b65225e3-5b6a-4ac6-a902-6b1427c694aa/

I am running this on a Windows XP SP2 32 Bit computer, in DEBUG mode. I am also attaching snapshots of the current settings in my computer.

Thanks

Kanhar Munshi