Oh I see, I wonder what the source of the error could be. Btw yesterday I was sending you messages on msn and it looks like you didn't receive any. It looks like there is some sort of compatibility problem between WLM and empathy. Btw you could have downloaded pidgin and tried it anyways. Btw did it tell you make sure that the cd or disk is clean? Maybe it meant that something is wrong with your hard drive. Are you sure you formated your HDD to ext3 file system instead of NTFS?
Other than that, make sure you burn the iso at the lowest speed possible and that you should have checked the md5sum before downloading your iso(
https://help.ubuntu.com/community/HowToMD5SUM). btw check out this thread as it has a possible solution which is adding stanza to menu.lst
http://ubuntuforums.org/showthread.php?t=1295714
Hope this helps, good luck and don't give up that quickly :P