I was using Pentiums but my new machine is an Athlon 64 (with AMD 3200 chip) and is VERY FAST with Win XP Pro and Poser and Vue 5 working great! The extra room the 64 bit processor has makes 32 bit processing easy. And when the 64 bit OS comes out- which will be fairly soon, (as it has been in beta for nearly a year) means you are ready for the FUTURE of 64 bit software... which is VERY SOON! BTW- I also use the faster SATA drives (serial) which speed up drive read/writes a lot over older ATA drives. New motherboards should be SATA ready, as well as offer ATA connectors for your older drives. I use a very fast WD Raptor SATA C drive, so my boot-up time is only a few seconds... (But I like Maxtor drives overall). Finally- don't forget getting a good ATI or nVidia graphics card for great performance in Vue 5 (E-on recommends either one). I have an nVidia Geforce in my Athlon and ATI Radeon in my older P-III. Vue 5 runs great on them (as long as you keep your drivers up to date) but the NVidia Geforce is the best, in my opinion.