DVD drives are becoming rare and it is a pain to store DVD discs of old software. One easy way to store them on hard discs is to convert each CD or DVD into an ISO file. That way, they can be virtually mounted whenever needed (like this).
Creating an ISO file from a bunch of files or directories is easy with CDBurnerXP. Open it and choose to make a data disc. Drag all the files and directories you want to be in the ISO from the top window to the compilation window at the bottom. Choose File → Save compilation as ISO file and you are done!
Tried with: CDBurnerXP 18.104.22.16843