I've got XP pro, (no eye candy) fully patched atop a 2Ghz P4, 1Gb of PC2700 DDR RAM and a Radeon 9700pro, and I have to say that since SR 2.1 (available at curious labs site) P5 has been a lot more stable, it's still terminally slow compared to Poser 4.03 running the same scene, but it doesn't crash nearly as much as it did. However it extrememly dangerous to introduce P4 light sets, as that tends to kill P5, and several people have also reported problems with such things as drivers for graphics tablets, printers and CD-writers. you'd be advised to rid your system of any of the above and see if that helps. It is slower than P4 in all respects, but once patched it should be fairly stable, in the time I've used it since the patch it hasn't crashed once, but then you can the number of times I've used it one one hand. YMMV later jb