when hedphones are plugged in windows should automaticly transfer the sound outputted to the headphone device. if the sound is still coming out of the speakers this probably means that windows is not regestering the fact that the headphones are plugged in try plugging them into all headphone ports on your pc. as for the microphone, if you double click the sound icon in the botom righthand corner of the screen (next to the clock) then you should get a dialog window one of these options is line in, however this will only output the audio not neceserily chang how it is being inputed. to test the micrphone try recording from it in windwos sound recorder, (start > programs > accessories > entertainment >soundrecorder) and then you should be able to see an oscillating line if there is sound being recorded. if no sound is being recorded, check your microphone, and then if it is ok try checking for (updated) sound card drivers.