SOLUTION FOUND ! (At least for me)
I tried eveything I mentioned in my previous postings.
Latest drivers, another distro of Linux, playing with BIOS setting, etc.
The only thing I did NOT try was changing APIC to PIC and assigning all the IRQ's manually.
I went out and purchased an ATI Radeon 9200 AGP (8x) card.
I removed my Nvidia GeForce 4 MX 420 AGP (4x) card.
I removed the Nvidia drivers and reconfigured X to use the ATI driver and DRI/DRM.
This is the Linux native ATI driver and the 9200 is the newest card that can use it.
No more proprietary drivers until "the man" addresses the issues and fixes the problems.
No more freeze, no more laggy video and Enemy Territory never looked or played better.
I glad I spent the $99 (U.S.) for this card. It's AGP port speed is double my old Nvidia, it has twice the memory and does not require a fan (less noise).
Also, my frame rate is up during game play.
I'm sure you were hoping for a better solution than buying a new video card but that's what worked for me.
Hope this information helps someone,