Windows 10 - no sound on certain files

I just installed Windows 10 on my PC. I have had it on my laptop for a while. The install was perfect except for one problem - sound on certain files.

I have a sound card installed with the SB X-Fi Xtreme Audio Driver version 1.4.90 driver software installed. Most things have fine sound, example: youtube videos. Some files have no sound, (I think the sound starts for the first second and then fades out?). An example is a .mov file I just got emailed. I tried the clip on my laptop which is also windows 10. The sound is fine there.

For the .mov file I have played it back in the default player, vlc and quicktime, all the same problem.

I have installed the latest driver for the audio card. I also tried removing the current drivers and letting windows install the default, and also removing and then installing the drivers myself.

I have not been able to get sound on the video clip. I have noticed the problems on other clips also.

Any clues appreciated, I am stymied.

I played with some settings in GOM player and VLC and started getting sound on that clip although in VLC player it sounds like it is in a cave. There is no sound in Windows Movies & TV, or quicktime player (which I uninstalled and installed latest versions).

Embedded videos now have no sound on firefox but seem OK on opera and chrome.

I have attached a clip showing my settings.

When I reset VLC it stopped playing back with sound. As I knew that I had tweaked something to get sound with VLC I went back looking through the options. Under Audio->Audio Device 'default' was selected. I changed this to 'Digital Audio Interface (SB X-Fi Xtreme Audio)' and it started working fine after that.

I tried the suggestions with AVIdemux but all had no sound on the clip.

Then I went into Control Panel->Sound and disabled Speakers/SB X-Fi Xtreme Audio. After that the Digital Audio Interface was the only active playback device.

Now everything appears to be fixed. Thanks.