Thanks for the replies.
Ratsarse: I think I did mis-understand the message like you said. I think if the message had been "Your system cannot run 3d acceleration as you have disabled it" I would have understood. I thought it meant that my system was totally incapable of running it.
Timmcat: I only tried to turn it off to see what it would run like without it when I got the confusing message(to me anyway).
Thanks again