Microphone not working on dv7 Pavilion Notebook (Windows 7)

The microphone on my dv7 Pavilion Notebook is not working.  I checked the sliding volume controls and have tried updating my drivers.  A few weeks ago, I “unchecked” a few startup items using msconfig.  Is it possible, I “unchecked” an item related to the microphone?  Please advise
In addition, I tried updating the CyberLink YouCam software, but I am unable to uninstall the existing software in order allow the updated software to properly install.  When uninstalling the program, I receive a “1628 Fail” notification.  Is there another way to force the  un-installation of CyberLink YouCam? 
Pavilion Notebook dv7
Operating System:  Windows 7
Product Number:  A1L75AV
Serial Number: [Personal Information Removed]
Thank you in advance.

Hi,
First, regarding the microphone problem, try the following.
Download the IDT Audio installer on the link below and save it to your Downloads folder.
http://ftp.hp.com/pub/softpaq/sp58001-58500/sp58226.exe
When done, open windows Control Panel, open Device Manager and open up Sound, Video and Game Controllers.  Right click the IDT device and select Uninstall - you should also get a prompt to remove the current driver, tick the box to allow this and then proceed with the uninstall.
When complete, shut down the notebook, unplug the AC Adapter and then remove the battery.  Hold  down the Power button for 30 seconds.  Re-insert the battery and plug in the AC Adapter.
Tap away at the esc key as you start the notebook to launch the Start-up Menu and then select f10 to enter the bios menu.  Press f5 to load the defaults ( this is sometimes f9, but the menu at the bottom will show the correct key ), use the arrow keys to select 'Yes' and hit enter.  Press f10 to save the setting and again use the arrow keys to select 'Yes' and hit enter.
Let Windows fully load - it will automatically load an audio driver, but just let this complete.  Then open your Downloads folder, right click on the IDT installer and select 'Run as Administrator' to start the installation.  When this has completed, restart the notebook again before cheecking if the microphone works.
Regarding being unable to uninstall Cyberlink Youcam, see if you can remove it using the Microsoft 'Fixit' on the following link - this is particularly useful in correcting issues on machines running a 64bit OS.
http://support.microsoft.com/mats/Program_Install_and_Uninstall
Regards,
DP-K
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