Interesting error message, since Beta 3 has not been released. Looks like the CTP release messages are ahead of the times.

>I can't install SQL ServerExpress 2005 beta 3 on my computer. I have a Beta 2 before that and following instruction uninstall ALL it's parts. Now I get the following message when i try to install Beta 3:
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>Microsoft SQL Server 2005 Beta 3 Setup
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>SQL Server 2005 Beta 3 Setup has detected incompatible beta components from Visual Studio or SQL Server.  To proceed, use Windows Add or Remove Programs to remove the following: previous SQL Server Yukon components, SQL Server Support Files, .NET Framework 1.2 and 2.0. Then run SQL Server 2005 Beta 3 Setup again.  For detailed instructions on uninstalling SQL Server builds, see the SQL Server 2005 Beta 3 readme file.
>

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>I read ReadMe but no luck.
>I haven't .NET FrameWork 1.2 on my computer I have only .NET 2.0 but if I uninstall it I got "There is no .NET Framework 2.0" when I try to install SQL Server. I feel like I am in a a vicious circle.
>I can't install Beta 3 because I have .NET 2.0 framework but I can't install Beta 3 IF I Have not .NET 2.0 installed.