Can i use Vista 62 bit, and use 32bit Revit System? Never used Revit before, been using archicad and autocad. Will things be better if i used Revit 2009?
1. I think you mean Vista 64 bit, not 62 bit

2. Yes you can, 32 bit Revit can run on 64 bit Vista.
As to answer your question for Revit, it's a bit complicated. Revit is not a 3D modeling program, it is a BIM program. BIM stand for Building Information Modeling. It takes apart an entire building, and breaks it down into it's most basic and complex components, from walls and floors, to pipes and circuits, to chairs and toilets.
It combines all of the aspects of HVAC, Electrical, Mechanical, Plumbing, Fire Protection, Drafting, Architecture, etc. It's a very intense program that can help you define anything in an entire building. It basically helps you set up the systems within a building that you are designing.
If you are a student, I would say no, do not use Revit. It's too complex of a program to be using for simple things.
It'd be like, using a chainsaw to cut some butter for your toast. It's simply overkill and ends up making things worse than better.
Unless if you are designing an entire building with all of its components and you know all the formulas to input into the systems of the building and location of the building, Revit becomes obsolete to you. Revit is designed for Revit users to work with Engineers, Architects, Plumbers, etc. in order to gain the information needed to compile together a complete system/database.
One final note. Revit 2009 versus Revit 2010. They are vastly different in terms of UI, and it takes some time getting used to. I prefer 2010 over 2009, because it's a lot faster and renders thing much more smoothly.
Hope that helps.
-Dustin