Hi, thanks very much for your replies. I did apply the patch long ago and am at Poser 4.03 .126 My specs are as follows: Pentium Celeron 500mHz 64MB RAM 8GB Hard Drive, 3 partitions, about 500MB free on each. 64MB Video Card Windows 98 Second Edition I'm not sure I've ever "defragged". I sort of know what that is, but I don't recall ever doing it. For a while I thought the problem was not enough free space on my C drive, but there is now between 300 and 500MB free on it and Poser still freezes. Thanks and I'll await further information.. Cenozoite