Sound Echos After Being Imported

i've been using adobe premiere pro cs4 7 months now, , reason problem has been occurring last month or so.  when import videos project, every few seconds or so, sound creates small echo lasts half second sounding audio skipping briefly.  not happen in original video before import it.  example.  when says "that guy ran brick wall." audio sounds "that gu-guy ran bri-ck-ck wall." instead.  if re-render footage or dump preview files , start scratch, audio still sounds that.  i've tried dumping imported files project, not rendering them, , exporting 1 big file doesn't help.  i've tried 1 video @ time , video between 30 - 60 seconds in length.  don't know begin fix this.  know it's not file type because i've used same settings since began using program.  camera use record footage still uses exact same settings.  help?

what file type, , specs. of audio?

 

tell system, i/o sub-system, i.e. hdd's, size, speed, amount of free space, controller type , how have them allocated, please.

 

good luck,

 

hunt

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