web server

I am planning on making an ubuntu based server out of an old windws 2000.  Advice?  How would I set up domain names on it?

Yea.  It looks like the computer can run ubuntu, but when i cant get the installer disc to run.  it sounds like a stupid problem, but it wont work.  Ive changed the boot order, but it has no effect.  The computer is a dell t450.