Sound is a shady area for me - so sorry if this doesn't help. I think your pc may be detecting the phone not just as a phone, but as a speaker as well. in audio settings you may be able to change the default sound source for CD's to your normal PC speakers. For example my default device for sound playback is "Creative Sound Blaster PCI", yours might be set to Skype Phone (or something like that). And when you unplug the phone the sound restores back to the normal speakers as they are now the only device. Hope this helps.