If you already have XNA 2.0 installed, you can download the Upgrade wizard from the XNA Creator's site. Details on how to use the Upgrade wizard are also at the Creator's site.
In brief, to perform a migration with the Upgrade Wizard, when you create a new project select the Project Upgrade Wizard template. Also, remember the location set in this dialog as your migrated project will be stored in there.
Then, in the next dialog you will be prompted to open your original project. You can then navigate to the *.csproj file of your original project.
If successful the project complete dialog will appear.
