Windows 7: The volume is random dropping and then coming up again, any idea whati

I'm getting random volume changes from my PC, that is the volume will turn itself down usually for a few seconds sometimes for a few minutes and then shoot back up again. First I thought it was poor videos on Youtube but VLC player is do it to video I know are fine.
I'm running Windows 7 Home Premium 64Bit the sound card is on-board the motherboard



I have tried to looking to see if other have this problem, they have but the solutions did fix my problem. The most common cause is in the communication settings, there is an option to cut the volume by 80% when an incoming phone call is detected, I have this option off.
I have also reinstalled the audio drivers with no luck.
The problem has being going on for sometime and is getting worse.

If this is a desktop, check the speaker connection, as an intermittent speaker connection could cause this. Or a problem in the speakers.

Please fill in the "My System Specs". It helps us to try and help you.

Hi grsymes
If this is only happening during communications, ie skype or similar program's you could try the following.
go into your windows sound setting's, Click start and type sound into the search box and click on sound when it shows.
Next click the communications tab at the top. you will have 4 options. put a check in "do nothing" and click ok.
If that doesn't stop it then go into sound settings again. Right click on your playback device and select properties.
Click the Advanced tab and uncheck "allow applications to take control of this device".
Click ok.
I hope this helps.

MY system spec should be filled in now.

I am using a desktop and all the cable are correctly connected.

Ganjiry-
I have all those setting you mention done.

Is it still happening since changing those settings?
What applications does this actually happen in?

Yes it happens after changing those settings.
I only really use Google Chrome and VLC, both are affected by the problem

This is really pissing me off. I know the people next door will start complaining soon about the volume when it come back up.

Sorry about the late reply. I didn't get a notification for your last post.
I'm a bit stumped myself to what it could be. Maybe somebody else could shed some light on it?

When you reinstalled the audio drivers. Did you uninstall the old one first?

No, I didn't uninstall the old drivers. I thought the reinstall would replace what was there before. I'll try reinstalling again tomorrow.

When updating graphic or audio driver's it's best to uninstall the old first and do a clean install of the newer one. Hopefully that will do the trick for you but if not post back and we'll see what can be done.