How install NetAdvantage_20063_CLR2x_NET(Infragistics controls)?

I am new to this netadvantage (infragistics controls).
Actaully in one of project (win app c#) they are used. and this proj. giving error because infragistics controls not installed properly.
i try to install it , the setup run properly but in vs 2008 no controls appear(infragistics controls).
and error "infragistics.Win.UltraWinTabControl.UltraTab" is not defined.  appearing.
can any one tell me how can I install infragistic controls that it appear in vs2008 toolbox?

You will have to create a new tab on the toolbox with a name Infragistics.

Then right click on the newly created tab and select "Choose Items".
A window "Choose Toolbox items" will appear.
Filter the items using keyword "infragistics" from .Net Framework components tab of the popup window.
click ok

All your infragistics controls will start reflecting in the toolbox.

If there is still any confusion. let me know.