CentOS 5 :: Installing CentOS 5.5 On An Old PC -- Query On An Error Message?

I'm trying to install CentOS 5.5 on an old Pentium 4 desktop PC I have, which is not being used for much other than being a MTA, and I want to migrate this functionality onto the CentOS platform for stability (Windows is a perpetual nightmare. I partitioned a spare 20GB to experiment with, and I want to install CentOS into here to play around with first so I can move my files around between Windows and CentOS, until I'm happy all of the stuff is gone, then I can scrub the Windows partition and claim the space for CentOS.

So, I've downloaded and burned the DVD and tried to install. I start the install with no args from the main install menu, and the process goes through some probing and then comes up with the "Welcome to CentOS" menu. I go through this, and then it tries to start X Server. It fails, and falls back to text mode. I get the "Welcome to CentOS" screen again, and then proceed through it. I set my keyboard layout to UK, then this message comes up at the bottom of the screen:

"_X11TransSocketINETConnect() can't get address for localhost:6001: Temporary failure in name resolution"

then on the next line: "Cannot open display :1" If I force the install to text, by typing "linux text" at the first menu, I get about the same way through, but the install just hangs doing nothing, and no disc access to the install disc.