lost Halion

I recently updated Cubase LE 4 to 4.1.3 build 853. When I open a project with Halion track or try to open new Halion track I get this message:

VST Mixer Warnings (Friday, February 11, 2011)

The plug-in “HALionOne” could not be found for Instrument Track!

How do I reconnect Halion VST?

Search the knowledge base for the “Refresh preferences” option. This should restore any installed VSTi’s.