Hi Andre, I got to say that you wrote a pretty easy to follow article. I'm not expert computer tech but I need to understand certain things in case things go wrong as I work with pro audio. I actually started my thread over at http://social.answers.microsoft.com/Forums/en-US/w7performance/thread/94a81980-94df-4341-9d85-50611921c011 . To make a long question short, I use a DAW called Sonar8 and I get the occasional dropout, but with my system specs it doesn't make much sense, the frequency is way to often. I followed you're instruction on how to find the cause of high cpu usage. i completed it but I would like to also know where does the DPC_Interrupt.etl get saved I found mine in '' C:\ '' and it was named Kernel not DPC_Interrupt.etl. Is there a way to name it something else? or put it on the desktop initially during it's creation? I don't understand the stats very well, it seems like under Interrupt CPU usage- Module -'' Wdf01000.sys '' is to blame the odd thing is that it goes to about 11% actual Duration, but the audio dropout happens 50 seconds later. I saved what I believe to be a representation of the issue, can you have a look and confirm there is a problem with DPC or anything else. Thanks. Also Im sorry if im posting in the wrong forum. im not able to upload my file so i post it here for upload , thanks http://www.sendspace.com/file/t5eaaa