Hi, first off, I've read through the thread and want to say thanks for all the great help you offer! The reason I wanted to check were the red peaks in the DPC Latency Checker below. This occurs on an i7 920 12GB with no application running. I've followed the steps and the summary table gives me the attached result. Not sure what to make of it. There was someone before who had a problem with hal.dll but the solution was not posted in this thread. I went through my drivers manually and tried to update but Windows says they're all up to date. ...sorry, I'm an audio not a PC guy... Any help much appreciated!