ive got a "ubuntu desktop CD".After inserting the disc and restarting the PC,the ubuntu screen comes with a 30 seconds timer on left hand side and options like---"start or install ubuntu","start ubuntu in safe graphics mode"..etc.i hit enter on the first one.A pop-up window came saying "loading casper something".Then this window disappeard.Now came the ubuntu screen with a PROGRESS BAR.it said "loading essential drivers"i waited for five minutes there but nothing seemed to happen.The progress bar showed 0% completed.i kept the PC running & went out to have a walk.On returning after a 30 min long walk,it still shwed the same old "0% completed" crap.i tried rebooting 5 or 6 times but no gain.......The progress bar just dosen't advance!!!Any recommendations?????---------------------------------------------------------------------------------------i am running a Pentium 4 PC with 256 MB RAM.I have windows xp SP2 already installed. windows is running fine.