Hi, what will you do with your pc? Ultimate has more function like home premium but is more expensive. So you have to make a choice which function you need and which not. You can have a look at Vista Business too. So first look which features you realy need and then look which version you need. 32 Bit or 64Bit good Question at the moment there are a few application that use 64 bit, but i think the 64 bit is the better choice, most 32 bit Application will run under 64 Bit but not in the other way. so long darph