Hello,
With Measurement Studio 7.0 we shipped a utility called ActiveX License Fixer. This was due to this known issue that the license of a released 6.0 will go into evaluation mode for 30 days if someone installs 7.0 released over the controls.
You should run this utility from the Measurement Studio 7.0 CD (it has a readme) and it will fix everything up for you.
Regards,
Jeff
NI