I can’t load UT2004 dvd rom edition off of my dvd rom. It will work 1/3 of the time and when it does it won’t install because of bad sectors of recording to the hard drive. It plays movies just fine but when it comes to the games it goes kirput.
What drive do you have? Could the drive be old/damaged/dust-infested/etc.? Could your disc be FUBAR?
Download CD-DVD Speed and run the Scan Disc test (Scan Disc, not Disc Quality). It’ll make a pretty picture and might give you a better idea of what the situation looks like.