I had my G4 Quicksilver set -up with OS 10.3.9 running OS 9....? (I DON'T remember which version) in "Classic Mode" so I could open up my old Quark 3.3 application. I developed Corrupted software with the Computer running incredibly slow. I did a Clean Install. No hardware damage. (I forgot it was long ago) how I set-up Classic Mode. I just nstalled 10.3 and upgraded to 10.3.9 But now I can't install OS 9. Do I have to re-fomat the HD to first install OS 9, upgrade to 9.1( up to 9.2.2 if I want) and THEN, install 10.3. MAC G4 Quicksilver 867 MHz 512Gig Is there any special way to install 10.3 so I don't erase the 9.0 System Folder ? Thanks.