I had the Feb CTP and the June RC0.
I removed them from the Control Panel's Add/Remove Programs.
The remove action in Add/Remove for the CTP's and the RC0 will pop-open the SQL Server 2008 Setup window.
After this you need to Select instance that you have installed.
Note: I had default instance of Feb2008 CTP and a named instance of RC0. Also I had SQL Express 9.0 and a bunch of shared components.
In the next window I chose all features to be removed as shown.
I removed the software completly.
I am presently trying to download an evaluation copy. I downloaded four copies (all are supposed to be evaluation copies) but all of them ask for a product key. I am trying to resolve this issue. Someone on the MSDN Forum suggesgted that I could use all zero's for the product key and it did'nt work.
