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janaFlag for United States of America

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Why we have Windows.old recently out of the blue

Hi,

Checking our computer we noticed a folder "Windows.old" dated just 10 days ago (Create date & modify date).  We know this folder is created when doing an upgrade, but we haven't done non to this computer, just the regular windows auto-updates.

Please advice on what could have caused it or how can we identify its origin?

Also, can we delete it? (it takes up 27.6gb exactly)
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jana
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forgot to include, our computer is a Windows 10 Pro Version 10.0.16299.64.
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You can just use Disk Cleanup (NOT in safe mode) just click the "Cleanup System Files" option if you're satisfied you won't need to downgrade to the prior version.  No need to go in safe mode.
It normally works in Normal Mode for me. But some people here have reported no, and Safe Mode always works. So try Normal and if not try Safe.
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Understood.  So if we decide no roll back is necessary, can we just right-click-delete on it? (Just like that or is there a recommended way?)
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You are very welcome and I was happy to help.