microsoft.ACE.OLEDB.12.0 provider not registered on local machine

Pls i need help urgently. an application am developing is showing 'the microsoft.ACA.OLEDB12 provider is not registered on the local machine. the syntax i used in my code is :

"Provider = Microsoft.ACE.OLEDB12, Datasource = F:\Users\KOTON USANI\Documents\BooksData2.accdb"

)

I have downloaded the access database driver engine, runtime engine from the sugestions given but its still showing the same exception. what am i doing wrong?

am using windows 7 32bit operating system
running vb express 2008
and its really urgent!