Routing sound to speakers

Basically, I accidently cut the wire on my old mic. I got a USB one meant for the PS2, that works with my PC, but I want the sound to play through my speakers and not the earphones, mainly cause its very uncomfortable and I prefer to wear it around my neck. How do I do this?
 
If im not mistaken you have the Logitech USB, right? if so click start > control Panel > Sounds and Audio devices. Click the Audio tab at the top, then set your Sound playback for you primary sound card, and Sound Recording to your Logitech USB headset
 
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