Windows 10 - Avast Saying Stuff in WinSXS is RootKit?

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Here are what Avast-Free Caught - https://gyazo.com/4a1cb4c173ce619aeeadae42f27f8648

I've done multiple Full Scans and Malware Byte Scans following this and they're not coming up clear, but I didn't even do anything.

So where could they have gone? Should I be worried?

I've also not updated recently (10+Days ago) and also rebooted and done multiple scans again.

What can I do next?

[Pondus]

Probably FP located in C:\windows.old

If you don't need it and want more disk space >>  https://www.howtogeek.com/223821/what-is-the-windows.old-folder-and-how-do-you-delete-it/

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Ah Thanks for the quick reply, I just went and checked now and the entire contents even with hidden file of WinSXS in windows.old is gone, I can't even see it in there anymore, should I just delete window.old anyway?

[Pondus]

  should I just delete window.old anyway? 

After upgrading all my machines to Win10 I deleted it on all machines

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Sorry, it says I require permission from system, what should I do (To delete Windows.Old)

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I managed to delete it, would you say im safe now?

are there any following procedures to do?