Quote - I thought about installing my old copy of Windows XP (32 bit) to save some money, is this sensible?
I already have 2GB of RAM on a 3 GHZ  Pentium 4, and a 256 Mb graphics card.
I've had this system for about 4 years (or is it 3?). Do I need to upgrade at all????

Well going from a single P4 to a dual core is a nice jump in speed, but only if you have and regularly use Poser 7. P6 and below will see little benefit, and may even become slower since multicore chips are individually worse then single core chips.

WinXP 32 bit will do fine as along as you stay under 4GB RAM. You need Win XP 64 only if you get >= 4 GB RAM.