So what's the problem? Save them to disk and transfer.
Or did you mean to say you can't get them on a disk? How old is the Mac? It's usually a drag and drop procedure... ahh, but you don't have an optical drive burner
A flash drive is easy if the old Mac will take it. Just make sure you don't format the flash for the mac. The mac will read a PC flash, but the PC won't read a mac.
Sorry I'm no help, but I would need more information about your systems. Good luck.