How do I clean up excessively large system files, such as those in the WinSxS folder?

[Michael Atkins-Prescott]

I have a second hand HP Stream netbook that I want to send to my niece. The previous owner didn’t factory reset it, and I didn’t know their password, so I couldn’t reset it myself. So instead, I did a clean reinstallation of the OS from a disk. I set up a profile in my name to make sure it was working, now I want to factory reset it so she can set up her own website profile. But it says that there is not enough free disk space to download the OS for the reset. Only 5gb is available from a 32gb SSD.This makes no sense, it’s fresh off a clean reinstall, so there should be no excessive files. I’v

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