What are some good virus scanners that are still updated for 10.3, preferably free or at least inexpensive, and definitely legal, and are not Norton AV nor Virex 7 trial version, nor ClamxAV? I say ClamxAV because (1) I already have it, and (2) the developer made it so that downloading the definitions via the program for any version older than one that runs on 10.4 disables the older version from being able to scan. (Is there a legal way to get the definitions to work on an older version)? ... My other question is, if I install 10.4 from the install DVD on a fossil system running 10.3 (a PPC Mac Mini), will I still be able to boot into 10.3 after? Thank you for your time.