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If you have other hard drives other than your OS you can put them there and clean install, install steam again and point them to your library. A portable USB drive can be used to back up steam games, then copy them back to the steam folder after clean install.
Have a read here too
Using the Steam Backup Feature - How To's - Knowledge Base - Steam Support
Last edited by Dude; 27 Oct 2017 at 16:22.