Start/Cortana Doesn't work

Hello all,
I'm a new member, and I need help as soon as possible, well, like the title says, the Start/Cortana doesn't work.
I tried that code using Powershell (admin), I did every step, I searched for help but nothing, I'm currently using Windows 10 64Bits (x64), I had Windows x86 once, it does have the same error as my current OS, but when I use that code, it works perfectly. So, please, I really need help.
Thank you.

Well, not really, I didn't even know about that, I will try it right away...

I kinda reinstalled it, many error lines came up, do I have to ignore that? If yes, your solution doesn't work (for me), if not, I'm waiting for a reply.

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