Fluttering sound

I am using an HP M7067c Media Center desktop. From day 1, when playing any type of audio (CD, DVD, iTunes, YouTube, etc.), the sound flutters through the playback. If anything runs, starts to run. or launch during the playback, the fluttering gets worse. I have removed the Realtek HD driver at least 100 times. After rebooting, the sound "might" play cleanly for a few hours, then the fluttering gradually comes right back.
I've gone through the StartUp and had all of the items unchecked except my virus/firewall software. When I check the StartUp an hour later, several if not all of the items are checked including my virus/firewall software. How does that happen when I only checked the virus/firewall software to be loaded at StartUp? They start to run in the background and the fluttering begins. I'm very disatisfied and have been for a long time with the audio playback on this machine. Is this problem a lack of memory issue or a sound/audio driver issue. If anyone knows and will tell me how to solve this crisis, I'd greatly appreciate it.

Hi  ,
Thank you for visiting the HP Forums! A great place where you can find solutions for your issues, with help from the community!
I came across your post about the Notebook, and wanted to assist you! I have looked into your issue about your HP Pavilion 15 Notebook  and fluttering sound in audio playback. Here is a document on troubleshooting sound if you need it. Please note remove any and all USB devices. Disconnect all non-essential devices, as these could cause some issues. Please make sure your updates have been done on the Notebook.  Here is a link to the HP Support Assistant if you need it. Just download and run the application and it will help with the software and drivers on your system that need updating. Here is another step to try. 1. Right click the Speaker icon in the bottom right corner by your time.
2. Click Playback Devices.
3. Click Speakers/Headphones.
4. Click Properties.
5. Click the Advanced tab on the Properties window.
6. Change the Default Format drop-down to the highest quality.
7. Apply the properties.
8. Click OK to close the properties window.
9. Click OK to close the Playback Devices. You can do a system restore. System restore will help if something automatically updated and did not go well on the Notebook. I probably would restore back two weeks ago that way you are sure to go back before the issue had started. When performing a System restore please note remove any and all USB devices. Disconnect all non-essential devices as they can cause issues. Please let me know how this goes.
Thanks.

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