Multimedia sound driver

Have installed Dragon NaturallySpeaking 12 and when I start it the following error message appears:

"Cannot find multimedia device. Check to see if your computer has a sound card, or if the multi-media wave-in component is missing from the sound card."

I have installed and used prior versions of Dragon NaturallySpeaking on this laptop, so I shouldn't be getting this error message, should I? If a prior version works, this one should?

I have uninstalled and reinstalled the software to try to fix this without success.

It's an ACER e-machine E630 running Windows 7 Home Edition.

Realtek High Definition Audio - 6.0.1.5963 - Driver software is up-to-date. The device is working properly. Location 0 (Internal High Definition Audio Bus).

I don't know how to check if the multi-media wave-in component is missing from the sound card - but don't imagine this is the problem because prior versions worked.