Go to Control Panel,then click on Sound.Choose Recording from submenu,there you can see your mic,just click properties and browse around. Also try your mic somewhere else,like Mumble,Skype or somewhere else.
Windows 7 installation has replaced your original system board sound driver, so the only thing you need to do is to re-download your boards sound driver and wallah. Using Intel's boardID program if you have a Intel board you can find this information if you don't already know it. Then simply search google for the correct driver...I hope this helps