>>You can upgrade from Vista to Win7 but not from WinXP. You'll have to do clean install of Win7 later if you go with WinXP now.
>>
>
>I see. Thank you. I guess for the peace of mind of VFP development, I will go with WinXP still.

BTW, Win7 will have WinXP mode based on Microsoft Virtual PC 7. See http://www.microsoft.com/windows/virtual-pc/default.aspx for details