Ubuntu freezes on install after it says eject cd, close tray and press enter

The title says it all.  I get all the way through the install till I'm suppose to take the cd out and reboot and it freezes.  I press enter a thousand times and still nothing. If I manually turn off the computer and back on it goes to a black screen with a cursor.  I tried the 32 bit and 64 bit.  this is my first time using linux.  I have xp installed and I'm dual booting. I can get Fedora to install perfect, but I want to use Ubuntu.   Thanks