i open up psx4all and select a game and it crashes can any one help me?

probably because that game is not compatible with psx4all. There is a sticky , official psx4all game compatibility list, that shows you all the games that work and dont work on the emu.

yeah ok thanks there still not working because I open the game and the screen goes black and then I can't do anything and the hames that i have say that they work on it

well then why dont you tell me what games you are using and how you installed them...

same happens here

grand theft auto and worms armagedon. OTB of them are .iso and I installed them by using FTP pro and I put them in the Roms folder PSX and changed them to 755 but they still don't work

Are you using the built in BIOS, or another BIOS?