dolphin crash after some time

[ultramann]

my dolphin (x64) crash after some time (on every game, like zelda:wind waker or monster hunter tri).
i have:

amd phenom II 720 BE
ati hd 4850
win7 x64

i tried some configures, but it don´t help. have someone an idea?


ps: sry for my english, i´m german^^