Plutonium

this is in solo play

when I'm in like round 3 or so in black ops zombies the screen keep freezing every 2 seconds until kill all the zombies then it proceeds as normal until i get to the 3rd house or barn which is like what 10 minutes into the game ? then it just crashes, just like that closes i think i see an error but sometimes it doesn't show. For reference its the torrented version from the way back machine so if anyone has seen this and fixed it id really appreciate it