While trying to run roms, my psp is freezing, am i doing anything wrong?

these are the steps i took:

saved my roms on ://Game/NES/Roms/(all my roms are here)

then when running the emu, i'm getting the data not found error (which is normal).

then i'm locating manually my .nes roms, but when i try to load it, the psp just freezes....

thanks alot in advance .

by the way, i'm running under 2.01 firmware