Backup and restoration is well discussed on the web so the only way to lose libraries is to have no backups.
That said, try Ninite.com and check off the iTunes item and let it run.
Why Ninite? Read https://www.howtogeek.com/201354/ninite-is-the-only-safe-place-to-get-windows-freeware/
I've had Windows 10 installed on this computer for a couple years now and all of a sudden Itunes won't open. I've checked on this forum for help but nothing exactly like my problem. I get no message just "no response" at all. I've rebooted a couple of times but to no avail. Any suggestions? I don't want to lose my libraries I already have on Itunes.