Cheat Engine

[BEO-WULF]

ok i have had and downloaded the project 64 and tried a couple of games on it they ran just fine. but until my sixth try with Zelda the ocarina of time it just lagged really really bad so i went into the options and i set the graphics and visuals to a low rate and i turned down the volume as well. after that it just ran fine just up until i downloaded resident evil for it and it lags so bad that it actually freezes up and closes its self out im not sure if its the emulator or the rom acting up beacuase i ran a virus check and found nothing of harm. so i went into my cache and i found nothing out of order. is it because my computer is old? from time to time i get to playing and a message pops up stating " graphics corrupted please restart emulator". so yeah i just need a few tips on whats going on.