how can I back up and install The Suffering

[mattyboy]

I tried to backup this which woked ok, as an ISO, but when I use this disks t install it (as to protect my originals which are safely put away) it work recognize CD2 it keeps asking for "suffering CD2" when I put it in during the installation process
HOW CAN I GET CD2 TO WORK????
PLEASE HELP ME!!
Thanks guys :) :) : :

[Luci]

you're not helping much.you have 1 or more virtual drives?