The Problem is when RDP from another machine to the Precision T3400 running Windows XP SP3, it hardware locks the machine everytime.
After getting the cold shoulder from dell technical support about Remote desktop locking up the machine being a software problem, even though it only affected my Precision T3400 machines in my office which one was just pulled out of the box this week. I found the solution to this problem. I'm very disappointed in Dell Technical support call line. I'm posting this as a service for anyone else who will have this same problem.
HKLM\SYSTEM\CurrentControlSet\Contro\Session Manager\Memory Management
Add a DWORD and call it: SessionImageSize
This solves the issue of no longer being able to use RDP with the latest nVidia drivers.
Thanks for posting this.
I slammed into this problem with three brand new T3400's at work while updating them remotely from home. Your post and a trip to the office resolved the problem.
Jalton, thanks for this post. I just bought 4 Optiplex 760's for our network with NVIDIA GeForce 9300 video cards and had the same RDP issue. Dell support told me to enable wake on lan in the bios (which didn't work) and then told me to reinstall XP! I disabled the video card after seeing your post and was able to RDP successfully. Then I tried your registry edit, enabled the video card and everything worked great. I'll ask for YOUR help before I call Dell next time.