“C:/Windows” is not a good idea to be kept. Better is to move important things, format the partition and reinstall Windows from scratch, Yes, you will have to install/update drivers, Windows and apps, make your favourite settings.
About Audirvana: You had to save the Audirvana Database file. It contains the indexes and some of your settings. Also some audio settings, radios and podcasts are automatically recognized after you login. I changed the location of the db file in settings. It is on my d drive. So after reinstall AS I had to: 1. Temporary move my as db from d to desktop. 2. Change the location of db in as settings 3, Close as after reopened 4. Move my old db from desktop over the newly created. After that open AS and everything is back!