All adobe Products install in a separate folder under the "Adobe" folder, and they dont appear to share any resources so I'd say your ok. I have CS2, half of CS1, Photoshop 7.0 and CS3 all installed and everything seems to work fine.Might be a stupid question but does CS3 have any conflict with CS2 at all? I'd like to have both on there for the mo until I get used to CS3...