vostro 200 echo output . realtek hd audio

greetings

i have dell vostro 200 and win7

my problem is my realtek hd audio has echo output sound

i already downloaded the R155944 driver from dell

i configure realtek hd manager ff:
speaker config:                 stereo or 5.1
speaker sounds effects: none
default format:                    studio quality
advnce settngs:                 make front and rear output.....