"Setup has detected one or more instances of SQL Server 2000..."
Tried to install the CTP and got a message stating that 2008 won't coexist with 2000. I had an instance of 2000 Developer Edition on here that I was testing some stuff with. I removed that, rebooted, and I still get the same message. Am I to assume that you can't even install 2008 if you've got the 2000 client tools installed, or am I missing something else?
Have a look at section 2.1.1 of the readme file, it states "To work around this issue, manually remove the registry key at HKLM\SOFTWARE\Microsoft\Microsoft SQL Server\80, and then re-run SQL Server "Katmai" June CTP Setup." Note that this will likely break the 2000 tools so uninstall them first or better yet use VPC/VMWare to create an isolated environment. CTP's often don't play well with other versions and can be difficult to uninstall cleanly.