Like many of you, I findthat clean installations tend to work better. But having tried an upgrade installation, then a clean on, I find that my system was much more stable with the upgrade. On the clean install I have problems installing new programs, shuting down cleanly, random internet slowdowns. These have occured over a period of a week, and repeatably. My advice is to try BOTH and see what works better for you. Remember, this is still "beta" even if it says "RC."