Labview errors in WinXP lab environment

We run a lab network with XP workstations and a Win2000 server. All
client machines are imaged with Ghost, and are subsequently indentical
except for SIDs. Software is installed by the local administrator of
the model machine used for the image. The USB tower drivers are
installed at the same time the Robolab software is installed.
A given class logs in as a single user with a common profile.
Openning Robolab, however, brings this error message:
"Error 8 occurred at Open File. Possible reasons: LabVIEW file
permission error, or NI-488, DMA hardware error detected."
A similar, earlier client image under Win2000 didn't present this
problem. Any ideas? Thanks.