Headset problem

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a friend of me does not have a problem with its headset first times is it usb headset to separate an older with 2 normal plugs now to the problem first has I as I it over skype called in each case my is correct than echo heard as well as the music on its PC ran however not which he said now has he something changed and now he hears his own is correct on in genes boxes also which he with me calls as echo ^^

white someone that to lie could and where can one the attitudes to change? because of skype alone it cannot be it also over windows the audio photograph program to nothing to take up there could

if it that forum is wrong does it to me wrong is again here and is this seemed to me quite unclearly quite suitably

thanks in vorraus already times