Can DVD discs be accessed by CD ROM with the help of any software?
Why don't you just go buy one, you can probably get a fairly cheap one that hooks up to a USB port, no need for all this technical mumbo jumbo, sheesh.
Alans suggestion will not work. The DVD disc can not be read by a CD laser. As mentioned in other comments, the 'strips' of data on a DVD disc are laid out in a narrower configuration.
Try to imagine a regular book that you can read and the text is at regular, normal, and comfortable size to you. Now imagine that you took a really strong magnifier and looked in between the lines you were able to read. Between these lines are words that are so small that you didn't even notice that they were there. You need a secondary device (a magnifying lens) to see them. Similarly, the data on DVD-disc is much more compact and narrows that that on a CD. You need a secondary device (a 2nd laser beam) to read the data.
You could convert the dvd to a file such as divx, copy it to a cd, then play it with your cd rom drive.
Like Tina mentioned, the answer is no. Not trying to be offensive, but to put this example into context, it's like playing putting a DVD into a floppy disk drive, or putting a floppy disk into a DVD drive.
this is not a matter of software, but a matter of hardware. The answer is no. If your drive was not built to read DVDs, there is no way you can make it read them.
To read a DVD, a shorter wavelength laser is required than for reading a CD ROM. That's because more data is packed onto a DVD and basically the tracks are narrower. Hence, most CD/DVD drivers have two lasers, one for reading CDs and a second for reading DVDs.
Have a look at this DVD FAQ.