See if this from Bob Lin's site helps...
http://www.chicagotech.net/vpnissues/vpnunavailable.htm

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Al Jarvi (MS-MVP Windows – Desktop User Experience)
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http://support.microsoft.com/KB/555375
> While using the create a new connection wizard in windows xp, the window
> that
[quoted text clipped - 3 lines]
> connection bottoms can't be chosen). I'm logged into the computer as an
> administrator. What do I need to do to enable the buttons?