Q: pleasee explainn the differences!
A: Vista Ultimate is basically Vista Home Premium and Vista Business combined, with a few additional features. If you are a home user, and cost is a concern, I would stick with Home Premium, it's less expensive and the hardware requirements aren't as great. With Home premium you can get away with a dual core processor and 3 gigs of ram. If cost isn't an issue, go with Ultimate. It has a few cool added features, nothing of real importance but fun to play with. If you do get Ultimate, then you really need a quad core processor, it works much better with a quad core, and 4 gigs of ram is a must. Compared to 3 gigs of ram, you will notice a significant difference in speed going to 4 gigs, using Ultimate.