Should be enough for Vista, but its very memory hungry - here's the official MS line on it.
Get Windows Vista: System requirements
Also consider other 'parts' of the pc like graphics card, but if its a relatively new pc it should be okay. You can upgrade to W7 from Vista, did your machine come with that as an offer? Otherwise its relatively straightforward...if you know what you're doing,
W7's requirements -
Windows 7 System Requirements
Windows 7: Compare Windows 7 to Windows XP and Windows Vista - compare OS's
Windows 7 Upgrade Considerations - can you upgrade or 'clean' install?
Get Windows Vista: System requirements
Also consider other 'parts' of the pc like graphics card, but if its a relatively new pc it should be okay. You can upgrade to W7 from Vista, did your machine come with that as an offer? Otherwise its relatively straightforward...if you know what you're doing,
W7's requirements -
Windows 7 System Requirements
Windows 7: Compare Windows 7 to Windows XP and Windows Vista - compare OS's
Windows 7 Upgrade Considerations - can you upgrade or 'clean' install?
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