Why? Do you have to re-install on a new PC? If so do you have access to the previous installation on your old PC? If you do click HELP > ABOUT and you will find the serial number there. If you registered the original with ULead then their customer service people should also be able to help.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.