Have you installed Nidaq 7.2 ? It comes with LabView 7.1. If you have not, then you need to install it either by down loading it from ni web site, or the CD titled: Device Driver Reference CD)
Normally, if you have chosen full installtion of LabView 7.1, you should have been prompted for the driver CD.
Note: you have to uninstall the existing versions of Nidaq and Max before installing Nidaq 7.2