How to install sql server 2000 in windows 7

Can't be done without a load of errors. Is SQL Express not good enough for you needs?

You might be better of getting an old PC and a copy of Windows 2000 (both dead cheap) and installing it on that if you really need an SQL server. Perhaps you could explain a bit more why you need SQL Server 2000 and what sort of scenario you use it in.

Edit: Alternatively, run it in XP mode.