On Windows 10, you can use the DISM command tool to repair the local image, which you can use with the System File Checker ...
XDA Developers on MSN
Install your games on a separate SSD - your OS will thank you
I always use a second SSD for my game installs (although technically I have three other SSDs with games on, because I hate re-downloading them), and I think everyone should. It's not about performance ...
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