First computer I used:
I have no idea what it was. It was something my dad borrowed from work (this was back in the early 80s). All I remember was it had quite a large keyboard with a number of red LEDs sticking out of it. There was a game for it called "shoot", where a little symbol (may have been the letter i or I, or something similar) would appear in one of 10 random positions across the screen, and you had to quickly press the correct number key to hit it. And to the very young me, who hadn't seen anything like this before, it was amazing.

First computer my family actually owned:
Amstrad CPC 6128

First computer I ever owned: a PC of some sort, I think it might have been a Pentium II running Windows 95.