Hello fellas
I updated My windows to build 15063, back when it was allegedly a preview build, but soon after, apps stopped downloading and Windows update stopped working, so I spent almost 2 months, looking at the problem whenever I was free, and found the problem. At first my keyboard kept on changing to GB and I thought someone was pranking me, then I deleted the GB keyboard package. Today I decided to investigate that keyboard issue, and turns out my whole system is en-Gb now.
So I tried downloading the en-US pack from online since my Windows Update was completely broken but lpksetup showed this:
Then I tried checking the optional features page in settings, all GB:
I always copy my ISO upgrade file to save my friend the stress of downloading the whole update, and luckily i still had it on my desktop. It was written en-GB. This means that the setting app of windows insider app downloaded the wrong language iso and I think its what has been causing my 0x80070057 error everywhere. I found this site that claims that the error could be solved in windows 7 by checking language settings... here.... So I wrote this in case this happens to anyone else. I still haven't solved it but I think downloading the en-US iso and re-upgrading to it will restore balance. I would try resetting my machine but i don't want to lose any apps.