What are the System Requirements?
SiteGrinder requires Photoshop 6 or later (including Photoshop CS3) under Windows or Mac OS X. SiteGrinder also runs in Photoshop Elements 3 and later on both Windows and Mac. Any machine that runs the appropriate version of Photoshop should be able to run SiteGrinder. Obviously the more RAM and the faster the processor the better.
SiteGrinder works best with Photoshop CS or later mostly because of the "layer comps" feature and the ability to nest layer sets inside other layer sets.