I typed in the question "How do you remove service pack 3 from windows xp" and it took me to microsofts site giving four methods for removing service pack 3. Method 1 was the "Add and Remove Programs" in Control Panel. And as stated earlier "Windows XP service pack 3 was not listed. Method 2 basically said windows service pack 3 was not present or had been moved. Method three is use the system restore point. This computer had not created a restore point. Method 4 is Use recovery console. I don't feel comfortable using that method so I haven't tried it. In the control panel is says service pack 3 v6165.