Good day for All
you have to download Remote Server Administration Tools (RSAT) for Windows 7 from Microsoft's web http://www.microsoft.com/en-us/download/details.aspx?id=7887
Second you have to these steps
1.Go to Control Panel, click on Programs.
2.Under Programs and Features, select Turn Windows features on or off.
3.Under Remote Server Administration Tools > Role Administration Tools, select AD DS and AD LDS Tools
third Enjoy with AD on your Desktop