P64 rookie here, questions!!

i just downloaded this great emulator and whenever i try playing a game the install screen goes on> i play a game and then when i close the screen and try to play again the same install screen goes again, like if its not installed. By the way i had problems with these 2 games:

Resident Evil 2 > The options screen in the start menu appears with lot of letters and blurry stuff and when the "intro" starts", a high disturbing sound goes on and the story narration is not understandable.

Bust a move 2 > the game is running way fast and dont know what to do with it.

Help plz!!!