Mic/Recording not working on Dell Windows 7 FIX!
This driver is specifically for Inspiron 5437:
Audio_Driver_FYH8F_WN_7024_A03
You should check out the official audio driver for your laptop on Dell's website.
If you can't find the Dell Manager, check for it in this directory:
C:\Program Files\Realtek\Audio\HDA\RtkNGUI64.exe
I hope this solves your problem.