How ca I view the GUID associated with an Active Directory user under windows 7?
This is easy to do using Active Directory Users and Computers.
Click View > Advanced Features
Drill down to the user you want to know about and open the Properties.
Click the Attribute Editor tab
Scroll down to the "ObjectSID" attribute.
The GUID is in an Active Directory attribute called objectguid.
Connection -> Bind -> OK
Browse -> Search
Base DN : (this varies per environment)
Scope: Subtree (this does nested search)
Attributes : add "objectGUID"
That should do it.