Home Basic:
20 GB hard drive with at least 15 GB of available space
Home Premium / Business / Ultimate:
40 GB hard drive with at least 15 GB of available space
http://www.microsoft.com/windows/windows-vista/get/system-requirements.aspx
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These are the requirements:
Note On system configurations that use system memory as graphics memory, at least 448 MB of system memory must be available to the operating system after some memory is allocated for graphics.
Hey u just need 12-15 gb for ur windows files and then it depends on ur other softwares installation