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NetPerfMon run time error

I can't add nodes or interfaces, or edit nodes, in my Network Perf Mon program.  Haven't tried for months, so not sure when this occured.  Running 9.2.47

Error is:

Run-time error '-2147024893 (80070003)':

Could not load file or assembly 'System Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies.  The system cannot find the path specified. 

Tried renaming SWNetPerfMon.cfg to force a new database, and same error there, so I guess this is not a corrupt database issue. 

Any ideas?