I've owned my PC for almost 3 years and...?

I needed to re-install W-8.1 again recently and discovered my Windows disk cracked. A friend offered to lend me his original disk. He also gave me some music as well as Microsoft Flight Simulator 2004 with his original disks. Ever since then my PC doesn't work properly. I have had to re-install Windows 6 times. Now Microsoft Flight Simulator 2004 stopped working too. I read that all Windows now are spyware to check what pirated software we've in our PCs.

In addition Mozilla Firefox, my favorite browser, does not work no matter 0how many times I click its icon in my desktop. Soon after that that Google stopped working too.. Also, my mouse pointer now disappears every few

minutes and I cannot use it. Finally my Windows stopped all Updates. Normally after a format-reinstall I would have some 30 or 40 updates to (re) install. I am now convinced that my PC problems in the past 2 weeks are just that. My PC is deliberately being made unusable.

Do you think that I'm right in suspecting that my problems reside in the fact that I used someone's original Windows disk and that all the music he gave me that suddenly disappeared from my Desktop was deliberate deleted by someone who hacks my PC regularly ??! I'm living at the moment on a long term basis in a 3rd world country due to my job and you just cannot find original software here. Everything seems to be pirated, software, & hardware. Thank you for your help/advice.