maybe the game is crappy on your crappy comps, but the syncing is fine on mine, isnt choppy, and the songs are original and surprised me with how uncrappy they were
ok, not saying its possible, but a parasite could cause a zombie like state of mind. Look up toxoplasma gondii. also, nanobots would cause zombies because after you die, they would keep working and "ressurect" you, you would only have your basic instincts tho, hunger mainly.