Just an observation but with Windoze 10 you can go to Settings>System>Storage and then click on the C drive to see exactly what is going for what. Can click on the individual items to see what each is using for what.
Mine keeps varying up and down as Windows updates, have seen as high as 14GB free right after a full cleansing but now at 12.4GB. Keep in mind it still has the 1GB recovery partition. If under 10GB I suspect you have a large hidden C:\windows.old directory.
Well it depends on whether you PC started with Windows 10. If it did then the key should be in the BIOS. If an upgrade or you have added Windows Pro then the key is in software. Either/both/all can be retrieved and stored offline with a third party product like Produkey from Nirsoft. Don't know why they are not on a sticker on the PC like they used to be.
BTW you can add a large SDCard (I use 64GB or 128GB) as a "D: " drive and tell Windows & apps to put everything possible there including the program files.
Really only need to remove all of the bloatware. If an x86 OS it is a lot easier than a -64. Have gotten mine fully updated and 12-14GB free but have had three other devices starting in 2012 that had 32GB. That said all previous small disk devices are running Win 10-32 (-x86) and not -64. Have run -64 on an older Atom device (532h) but it had a 120GB disk and it was slow.
Might consider running the Chrome OS, it is designed for machines like these but would pull another system image first (have a TB external drive here with about 20 different images from different machines at different times, just need a repair USB disk for each then the images come up as a menu screen. Once I pull an image I always rename its directory to something descriptive.
Think the bottom line is that Microsoft needs to raise the bar for a Windows 10-64 install for a new machine to at least 4GB of RAM and 64GB of disk and lesser machines need to be limited to -x86 (2GB and 32GB) or Chrome/Linux. Personally would also limit -64 to four core CPUs but I am not a marketeer. (/rant)
ps there are some nice Spin1's with quad core N4200s and bigger disks like the SP111-32N-P0FA but those are not loss leaders and are rarely found in a big box store.
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