I'm gonna side with DataMan on this one. If the livecd isn't actually working right it could be a bad burn.
If you have another pc to try the cd on, try it. If its the same problem I'd assume a burning problem. If not, maybe you have a case. But errors with live cds can be caused by bad burns, not just hardware problems. You never know, if one piece of data didn't get written or got written in the wrong place or who knows what else that could be messing you up.
If it isn't too much trouble to try it on a new PC or reburn it then do so.
If not, your choice. But if it is this you can solve the problem on your own and enjoy the minty experience without having to wait. Ya know?
I'm not trying to be rude either, but I think DataMan did have a point there.