What kind of video card do you have? What driver are you using?
Please post the rest of the error message, and the contents of /etc/X11/XF86Config-4. PCLinuxOS is based on Mandrake, so I'm assuming Mandrake defaults for the name and location of the configuration files for the X server. You might also want to look at the contents of .xinitrc (a hidden file which should be found in the home directory of each user. Root's home directory is found in /root).
Since you can't get into X, there are a number of ways you can examine this file (or files) and post the contents.[list=1][*] From the console login (after logging in, naturally), you can use vi (or nano or pico if installed) to examine the text file, and lynx (or links, again depending on which one is installed) to surf to this site and post;
[*] If you have a Live CD such as Knoppix or Mepis (or Morphix, or Slack Live, or what-have-you), you can boot from that into a full desktop that runs from the CD, mount the PCLinuxOS partitions and examine the file using the Live OS's text editor, then post using the Live OS's browser;
[*] If you dual-boot with Windows, or this computer is available over the network to another box which uses Windows, you may be able use the free Explore2fs
file manager to open the contents of the file in Notepad, as long as the Linux partitions are ext2 or ext3 (Explore2fs does not read ReiserFS, sadly). Posting I think you most likely know how to do under Windows
I find it odd that PCLinuxOS does not boot you into a graphical login manager by default. Did you set it up not to do so, or are you getting error messages indicating that X cannot be started even before you reach the console login?
Even the clip of the error message looks unusual to me. I don't use SSH or XDMCP, so I can't be sure, but this looks awfully like a failed remote login, even to my inexperienced eye. I have no idea why such a thing would be happening, but perhaps there is something about your install choices that would give a clue. Did you do anything unusual during the install, or make any choices that you just guessed about during the network device install, or the X configuration?
Anyway, hope this helps to some small extent, please post more information about your configuration.