I was just flicking through the pages of abandonia.com and what do i see...

http://www.abandonia.com/games/en/346/MDK(MurderDeathKill).htm

Quite possibly my favourite game of all time, free

Theres also lemmings, cannon fodder, doom2, civ2, GTA, and the original descent

They have Quarantine. I used to waste so much time playing this game, but it was just so good.

Heh, I remember when mdk came out and I was like man, I wish my pc could run that

They have Street Rod too, the crappiest, but also most brillianty entertaining game of my youth  

btw:
mdk install directory has to be in the root in c: to run.