Have you checked that Win 7 has found the driver
for your device? Windows should find device drivers
however you say you have just installed it which leads me
to believe that you may be using older hardware, and this being the case
Windows 7 may not always find ALL of the required drivers.
For example on an old Toshiba laptop of mine a Windows 7 Professional install
after having Vista on will not find my webcam driver.
Check the driver first is what I'm saying.
By the way- what is your Audio software as listed
in Control Panel? (ie: the second image was opened by clicking
on what software for example- Realtek audio manager)