Inbuilt mic for Compaq presario C700 not working

Sir can you please tell

1. which windows are you using
2. which software are u using for voice
3. which services pack are you using
4. which drivers are you using:


the answer lies in above questions


if
1.
a) vista SP1 no problem go to service center or check for latest drivers
b) xp load sp3 and go to control panel and hardware testing in sound
if not: then load latest drivers
else : go to service center
2. yahoo: got problem in server/ use skype for once to test
3. sp-3
4. latest drivers are sp35940 and there is a different procedure for loading them

if problem is not solved ask me again

thanks and have a nice day