Well, gosh, I ran Poser 4 on a PII 450 with a 14 gig harddrive under Win98 for over two years and had no problems like that. I did have 256 megs of ram though. All the above is good general advice but your problem is most likely VERY specific. I would suspect a conflict with your video card if your mouse pointer is freezing. That's the sure sign of a hardware conflict somewhere. Defragging or upgrading to WinXP isn't going to fix it. You have a 64 meg video card? the card I'm sure is much newer than your machine (500 mz celeron). Is it AGP? Be sure the card is okay with your system and try out different drivers for it..sometimes newer drivers are worse than older ones, especially on older systems. I only had an 8meg nvidia zxv (older even than the TNT) and it worked fine with Poser 4...I could even use full tracking.