Your CD is bad. As indicated in the error message (Error reading sector).
Try checking the disc in another computer, or burning another disc.
(You should know what to do when I tell you this. Otherwise, you aren't supposed to use UBCD in the first place.)
Try checking the disc in another computer, or burning another disc.
(You should know what to do when I tell you this. Otherwise, you aren't supposed to use UBCD in the first place.)