Ensure that you meet this:
Minimum Requirements:
* Windows 98, ME, 2000 or XP, Mac OS X 10.2.6, Linux, FreeBSD or Solaris
* GeForce 2 or higher 3D graphics card
* 1 Ghz CPU
* 512 MB RAM
* 1 GB free disk space
* 56k modem Internet connection
Recommended Requirements:
* Windows XP, Mac OS X 10.2.6, Linux or FreeBSD
* GeForce 4 or higher 3D graphics card
* 2 Ghz CPU
* 1 GB RAM
* 1 GB free disk space
* Broadband Internet connection
If you do, and as you say have the game updated, no sound, no vertex buffer and so on, I guess you can try the following:
Perhaps your psclient.exe is corrupted, try moving it to a different folder and run the updater again, it should get a fresh copy, try then relaunching when it\'s downloaded.