As far as the memory problems....do a search around here...there are tons of threads dealing with this.... I had many similar problems...rendering locking up geometry problems, out of memory errors when I have tons...it wan't unitl I installed XP that this was solved. As far as installing files, be sure you're not creating or installing into different runtimes, as this will cause the program to not find them..... I can't remember exactly, but I think 4.03 created a new directory ???? I also had at one time 3 different runtimes....by not extracting zips to the correct one.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854