Are u getting stuck at the install process or is the install complete and you're not able to reboot the PC after logging in?
If its the latter try the commands -
poweroff or
shutdown or
init 0 or
init 1.
Please note, you would need to be logged as the superuser to be able to fire these commands
(If I am not mistaken i.e.)
If its the former - maybe your install CD is corrupted/scratched. If it's possible - try installing from a new CD.
Hope this helps!
Linux