In short:
Try to find your old Media Creation Tool if you have it stored somewhere and successfully used it before, it MAY work for you.
Complete story:
Old desktop decided to quit and I now have a new desktop, bought seperated parts through Amazon, sharing no components excluding the SSD. Finished the build 2 days ago, installed Win10 Pro that was freshly downloaded ~3 days ago, and system started to function
weird today. I decided to reinstall the Win10 and hope it would wipe out some of the problems, some of them being Cortana is gone, alt + tab dont work, Steam game mostly was not put in the very front, leaving the taskbar under it and clickable, Win10 doesnt
want to download updating patches, etc. I Went into MS cite to download the MCT, it popped up this error code. Then tried it with my laptop, same error code.
I recall that I had an old copy of MCT which I stored it in my portable HDD. I found it out, and it has the creating time back on 2016.July.31, excuted it, and it is working. I am now waiting for it to do its job. As I have done writting this reply, it finished.
I will be trying to reinstall Win10 and leave comment below.
Forgot to do the reply.
That MCT created a ISO that was the very first version of Win10, and it took some serious time to do the update to the newest version. But then the OS runs all fine.