Computer problem and random conversation topic!

There were no problems, and it was not a new computer. Just a new hard drive, as my previous hard drive with the OS on it died. My dad installed it, although I could have done it as well. (He's a computer worker, so he tends to know how to do stuff xD) The OS is 100% legit. It was acquired for free, but it came directly from Microsoft, so yeah. My computer had no problems before, although I did get one of my emails hacked at one point, I got the malware out but - wait that's not the point.

TL;DR Version:
1) No
2) My dad.
3) Yes.
4) Legit but free.