When you have out of memory issues, you should take a look in Task Manager (Ctrl-Alt-Delete on Windows XP) and see how much memory Poser is eating up at the point it throws the error. Note that this number isn't very accurate (if you know how to use Perfmon.exe, that gives better memory use stats), but it will give you a ballpark idea. You can hit hard memory limits in Poser with a single figure, if you do the wrong things, and if you're hitting such a limit, you could add a terrabyte of hard drive space and it wouldn't matter. As pointed out elsewhere, texture filtering causes a tremendous memory load, so it is a great first thing to check on.