X-Windows,Install Shield on CentOS

I have a fresh install of CentOS 5.2. I need to install a commercial package that uses InstallShield. Every time I run the installation program, it gives me an error that tells me it can't open an xwindows window. The system autoboots into Gnome. I open a new xterm window by typing xterm in a terminal window inside of gnome.

Can anyone provide some guidance on how I can make this happy to install? It would be greatly appreciated.

Jeff Pearson