The SQL Server install checks the operating system when it starts, and Windows 2000 fils this check.
The error message will tell you the name of the rule that does the check, and you can rerun with a /skiprules parameter naming the rule that failed.
However, if you do get SQL 2008 installed on Windows 2000, do not expect that it will work correctly. If you do get problems, do not expect that anyone can give you a solution other than re-install on a supported operating system.
Original author: SQL Server FineBuild 1-click install and best practice configuration of SQL Server 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005. 1 Dec 2016
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Disclaimer: All information provided is a personal opinion that may not match reality.
Quote: "When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist." - Archbishop Hélder Câmara