Lost Presets?

I recently updated Cubase 5 to the latest version and have lost practically ALL of my presets. Everything from the initial studio set-up to the synth presets…everything is gone.
Any suggestions on this one? I suddenly can’t even export my midi tracks (that used the bundled synths).
If anyone else has had this problem and was able to resolve it, please let me know.

Platform: Win7 ultimate

There’s a Knowledge Base Article that will explain what to do.