What is RSAT ?

Microsoft Remote Server Administration Tools enables IT administrators to remotely manage roles and features in Windows Server 2008 from a computer running Windows Vista with SP1. It includes support for remote management of computers running either a Server Core installation or the full installation option of Windows Server 2008. It provides same functionality to Windows Server 2003 Administration Tools Pack

Download For X64 Vista Sp1

https://www.microsoft.com/downloads/details.aspx?FamilyID=d647a60b-63fd-4ac5-9243-bd3c497d2bc5&DisplayLang=en

Download For X86 Vista Sp1

https://www.microsoft.com/downloads/details.aspx?FamilyID=9ff6e897-23ce-4a36-b7fc-d52065de9960&DisplayLang=en