When you state that you "use the old PAF 3.0 disks" are you referring to backup disks or your data disks? PAF 4 will open your PAF 3 data without any conversion. Just click on FILE | NEW and locate where you currently have your PAF 3 data stored. Then click OPEN. You will still be able to re-use this data in PAF 3 provided you don't add any photographs. Refer to the HELP file and look under DATA CONVERSION.