If I understand you, Dell sold you systems that don't have the capacity to run software that they supplied as part of the package. To my mind, that's a no-brainer: goods not fit for purpose; you have a right to reject them.
But ... I had a similar issue with Dell some years ago, when a system would not run software that was bundled with it. I got my money back, but I had to battle hard for it. I am generally good at asserting my consumer rights, and this was the only time in my life that I needed the help of a solicitor in order to do so.