gpedit.msc in Windows Vista
A few of you have asked is there is a gpedit.msc for Vista. Well that question has a yes and no answer. Visat Home and Vista Home premium dont have gpedit.msc. But the other versions of Vista do.
But fear not you can still used regedit and this spreadsheet from Microsoft to make the required changes
Spreadsheet : WindowsVistaGroupPolicySettings
Hope this helps