boot the ubuntu cd and copy the files onto a usb key or usb external drive.
9.10 is pretty good at auto mount of external drives even if they are not plugged in when you boot.
Burning to cd under linux is not any better or worse than under windows. Often the burn will fail to close the disk or will burn files and folders that cannot be read. If you have isobuster you might be able to read the cd you burned and recover the files from there. Sometimes even that will not work.
Failing these methods, you can remove the drive and put it in an external usb enclosure. They are very cheap.
Looks like it should be an 80gb ide drive. A howto replace the drive should be on this page.http://esupport.sony.com/US/perl/model-doc...amp;region_id=1
The enclosure is very cheap.http://www.amazon.com/Drive-Aluminum-Exter...y/dp/B000XPS3U6