The volume on windows vista 32bit home premium says to be empty.
This is affecting Windows Defender to turn on.
Please repost your problem with a lot more detail in a more appropriate forum - Windows Answers Vista System repair....
http://answers.microsoft.com/en-us/windows/forum/windows_vista-system?tab=unanswered&page=1
Noel Paton | Nil Carborundum Illegitemi | CrashFixPC | The Three-toed Sloth