I recently upgraded to Snow Leopard from Leopard and I am experiencing some issues (ie lagging, longer than usual shutdowns) so I figure a fresh install is the best thing to do. Should I reinstall Leopard and get it up-to-date as far as software updates or should I not update anything and just install Snow Leopard right after Leopard finishes installing? Also, what is the proper way to remove OSX and have a clean reinstall? I do not have a full retail of SL, just the upgrade disk. Any other tips are encouraged. Your help is appreciated.