If you selected the Backup option during the Support Pack installation, files that are overwritten by the Support Pack files are backed up to sys:\system\backSP8 (or to the location you specified) so that you can restore the server to its original state if necessary. If you didn’t select the Backup option, you can’t uninstall the Support Pack.
Do not uninstall the Support Pack if you installed any products or patches after the installation of the Support Pack.
At the server console prompt, type NWCONFIG.
Select > > .
Press Delete, then answer Yes to the confirmation prompt.