The ticking from the HDD is indicative of a HHD failure.
If you want to test it to find out then I would grab a copy of GSmartControl GSmartControl
which can be run from an.exe in windows or "recommended" burned to a live disk and run from CD/DVD or pen drive (if you use Rufus to make it bootable) to check the disk for bad sectors / failure. https://gsmartcontro...x.php/Downloads
While you are at are it it I would test your RAM with Memtest86 burned to disk.
You will not need to buy Windows 10 again your license is saved to your machine and when you install Windows10 press I do not have a license key to carry on and it will auto activate when your are online.
You will have to tell the steam client the root of your steam downloads and they will work again from your second HDD.
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