Hi Casi,
Go to Nirsoft and Download
DriverView. Open it up (it's a Standalone and doesn't install). Click on the Company column header to put them in alphabetical order. Scroll down to Realtek. In the Driver Name column you're looking for things like RTKVHD64.sys and RTHDMIVX.sys. If you look under the modified date column, that is their date.
The official route is through the Windows
DeviceManager under
Sound,Video and Game Controllers.
GoTo
Start button, type
devmgmt.msc in your
Search box or a
Run... window. This will open the
DeviceManager.
If you right-click on the
Realtek High Definition Audio entry you can view its properties. Clicking on the
Driver...