Microsoft seems unable to do language settings as well. I bought a laptop in Germany that came preinstalled with windows, so the first thing I did was switch the OS's language to English. At some point during setup it also asked for my region or some similarly called info and I said Italy. The result is that now most of the OS is in English but random pieces of it revert to either German or Italian every now and then, especially error messages and similar things... Luckily they are languages I somewhat understand at least!