Uninstall Service Pack 2

Hello i have tried to uninstall Service pack 2 through the windows directory and through add and remove programs. I found no such folder in the windows directory called $ntservicepack$ even when view hidden files is enabled. And there is no site of it in add and remove programs even when show updates is selected. I have tried installing service pack 2 again to see if it would replace the uninstall files but had no luck. It is a problem i have never encounted and would much appreciate any advice thank you..