Newbie question - no X (or Gnome)

[ubuntu at cbcinternet.co.uk]

Sorry if this is awfully straightforward - Ive successfully setup Ubuntu
on my old Toshiba laptop and a couple other PC's.

On my home system I'm running a basic AMD 1.3 Gig processor with a Ge
Force Ti4200 Video card. DHCP is picked up automatically over my broadband

Ubuntu installs ok until I get to X. Whcih says there's a problem. Module
Loader not installed (from memory). Which leaves me with no GUI for Gnome.

Is this something stupid I'm doing or is it an nVidia based problem?

Regards to all

Mike/Edinburgh/Scotland