If you move up to SQL Manangement Studio from the Express version you will find that when you run Management Studio it will not be able to connect. You may well get errors on launch which suggest that an exception has been trhown due to impcompatibilite in the version of .NET classes. The Express version will fail to run at all. The fix: just uninstall Management Express. No reboot required. The CTP Management Express and the full Studio products don’t live happily together. No real problem as the Studio has all the features, and more, of the Express version.