Hello George,
Thank you for contacting National Instruments.
Have you tried rebooting your computer? If that doesn't work, you will probably need to uninstall MAX (which will uninstall NI-DAQ, NI-VISA, and a number of other drivers). Then reinstall all of the programs from the Device Drivers CD.
Let me know if you have any further problems.
Sean C.
Applications Engineer
National Instruments