From: Sherryl Radbil on
Hi Bill,
Registration problems are tricky to diagnose remotely.
We've greatly improved error messages from registration problems in newer releases so if you're on an older release and can upgrade to R2009b you should do so.
Also, registration is different on XP and Vista due to Vista's UAC, but in both cases you must be logged in as an administrator of the PC or be running MATLAB as an administrator in order to successfully register.
Another thought is to provide the full pathname to the adaptor to daqregister.
Search for daqregister both on The MathWorks website and in these newsgroups for additional places to find information.
Sherryl