NEED HELP WITH NES SNES EMULATORS

i downloaded all emulators to my psp and they where working great, when deleted them to see if they all worked because they all couldnt fit on my 30mb card. i tried them again and now i get an error message that says could not load game. which is weird because i was just playin them. i have version 1.50 please help!

Be sure to use the pack gen on the side bar of the site.It should fix ur problem, if not then try formatting ur mem stick.BEfore u format it, take everything off by going into USB connection.If u dont want stuff u dont want deleted, take it off and put it on ur desktop and then format ur mem stick.Tat should fix ur problem, or u just havnt installed it properly.

WHICH PAK GENERATOR ON THE SIDE? HELP!

K, keep scrolling up till you see the PSPBREW logo. Click that. Now look down, and right under it should have this blue rectangle that says Brew Menu. And right under that is the brewpack genreator.