Strange things happen with Poser, I just have the opposite problem.
I used Poser 4.01 and worked fine with Windows 95, 98 and XP for ten years. When I changed to XP64 Poser refused to run giving an out of memory message, updated to version 4.03 (no memory update) and Poser returned to work normally. Next applied the memory update and Poser continued to run without problems.

Stupidity also evolves!