Laura,
I would suggest removing MAX (Measurement and Automation Explorer) using the add/remove programs from within Windows. I would then firstly try a reinstall of the software. Maybe obtain a new copy of the software.
Generally this gets installed with a driver i.e. NI-DAQ.
Can you supply further information on the version of LV, the driver your installing etc. This will help me narrow down whats happening if the re-install (after uninstalling MAX) doesn't work.
Kind Regards
Steven Bird
Applications Engineer
National Instruments