Today I opened up a composition I have been working on with VDL sounds for the mallet orchestrations.  However, when I tried to initiate playback, no sound came out.  As always, I went into Kontakt 2 to check out the issue.  None of my instrumentation had been saved.  I shrugged and tried to choose the instruments again, but when I tried to use one, it informed me

There was an error trying to acquire a license for this patch! Error message:
This copy is not yet activated.
Please use the service center to activate.

However, I know I activated it when I installed Virtual Drumline.

So I went to the NI Service Center, and it crashed on me.  Twice.
Has anyone had this problem, or know how to fix it?  I can't seem to get any of the sounds in Virtual Drumline nor get Native Instruments Service Center to work on my computer.

Windows Vista.

Do you have the most up to date version of the Service Center?

[url=http://co.native-instruments.com/index.php?id=freeupdates#NI_Service_Center]http://co.native-instruments.com/index.php?id=freeupdates#NI_Service_Center[/url]

Indeed I do.  The problem seems to be Native Instruments does not want to run on my computer.

Right click the Service Center icon and select ";Run as Administrator";. Can you run the SC then?