A step by Step Guide for Installing SQL Server 2000 Service Pack 4 -by Paul Zanbaka

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 Open the x86 Folder

Open The Setup Folder

Setupsql.exe

From here on Click Next 4 times in a row Until you get screen below

You must select upgrade Microsoft Search...

Continue, OK, Next

Wait for Installation to finish and reboot your server

You will know when you see this message