Soundx are missing, how can I find it back?

I am a beginner, sorry about that I have to ask this question, but I really don't get it how can I do.
My native language is traditional Chinese, I'll try to express my question in English as much as I can.

There's no problem until I restart Studio One 4, I get a warning message:

　3 files are missing.

　　Accordion.soundx (not used)

　　Fender Telecaster.soundx (not used)

　　Vibraphone.soundx (not used)

But I need " Accordion/.../Paris Filmscore* " and " Arp Hold " key to apply this tone to my midi code.

It could open a drop-down list, but now only have "(no presets)"...in every "Instrument/Multi Instruments/New Multi Instrument/" tools. 

How can I find it back - Accordion.soundx, the tune named Paris Filmscore, New Multi Instrument tools and its drop-down list???

Environment: Win7, 64bit, HP Probook 4441s

I hope I can find the solution. 

Thanks for reading!