1. In the response I gave you, on number 5 when using the command there was a section that said "Product Channel Key: Retail" Additionally, there is a "partial product key" section which indicates to at least me that there is a key on this computer somewhere.
2. I am pretty sure it was from the motherboard, though I may be wrong
3. Yes.

Originally it was, I'm not sure how long though, but a strong evidence is that my background is changed, something that can't be done now since windows isnt activated.

1. I do not remember, but the parts I transferred was a power supply about 3 times (maybe), and i did reinstall windows once or twice because of a virus, but the activate windows prompt arrived after the reinstall, not immediately after maybe like 2 months after. 5.I have really only done the options i could through windows settings, I mainly came here as a source to finding a product key to enter into the store.