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Hi calcu007 ... and welcome to the forums
There are various ways to fix the naming problems in Windows 10. Since you've just reformatted and reinstalled, it might seem crazy to suggest doing that again --- but it is the safest route for having your Windows Store programs work properly, and for you to see the right name at login and the right name on your user folder. The steps are: 1) Install Windows 10, using the "local account" option. 2) After the installation is completely finished, and has restarted several times.... check that your user folder and sign in name are just the way you like them, then visit Start > Settings > Accounts > sign in with Microsoft account (or "connect to a Microsoft account"). The user folder will remain unchanged.
If you want to try other various methods for renaming the user folder ... these carry risks & caveats - so make backups first. The Windows Store, in particular can be a bit crazy when things go sideways. All the user installed programs might need to be reinstalled, since some Registry entries would still point to the older folder name....in fact, heck - let's not go there. Since yours is such a recent reinstall, try it again, with a local account first.
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