How can I get GT3.vol on my Hd . Always get an error msg

Solution is not immediately obvious to me given the environment you describe.

Try the Winzip method if you've got the HDD space to spare. It'll tell us whether or not a reading application (as distinct from a system mechanism) will work. I use a Toshiba SD-C2502 DVD ROM.

Is there anything that is different about your system and/or its device drivers?