Below are the basic requirements for Windows Vista.  There may be additional requirmens depending on if you select home basic, home premium, business or ultimate.

    - 1 GHZ 32-Bit x86 or 64 bit processor

    - 1 GIG of system memory

    - 1 40 GIG hard drive with 15 GIG of available space

    - DirectX 9 graphics including at least 128 MEG of memory