gina try using a different usb port... sounds like the one that you are using is loose or not functioning right.
Did you think of emailing your old photos to yourself and then loading them onto your comp that way. Or you can post them onto a free based site such as
www.imageshack.us
My computer doesnt have an A drive so i dont know what i could tell ya. All i use are jump drives and CD's for pictures.
Id say switch towers and load your pics on the net. If you have no other choice but that can help you save them and may take some time..
Oh yes usually when i want to save pics from my comp to my jumpdrive i open the file and do a save as and load it onto my E: Jumpdrive and it automatically saves it there.
Good luck