I recently had to reinstall iTunes because the program was missing components. Once I did my entire library was erased, can I get it back?

My PC wasn't connecting to the Internet at my home so I did a restore. Once complete, I tried to open iTunes but it said there were components missing and to re-install my Full Library was in the iTunes Music folder but after the re-installation it was all erased. I did a media scan but it only found music from folder I had Saved in folders.

Is there any way that I can find all the music that's been removed? It was over 3,000 songs