Start>>Control Panel>>Hardware and Sound>>Under Sound click Manage audio devices>>Then click on recording and check whether your mic is on the page.
If there's none means something wrong with your mic,
If there's a few devices, try to set each of them to default device and try to record something.
Hope it helps...this is what I did to my laptop.
Hi , I have also some problem with mic. Iam using Dell Vostro. recently i have formatted my OS with Windows 7 . I had navigated through the path u mentioned, i didnt find any mic symbol,
I have speakers/headphones,
communnication Head phones,
Thanks for ur help, now how to proceed. Please suggest me.