Audio Distorted and causing stuttering on the machine

Ok this a problem that i have had for quite a while. I have taken it to the repair shop and they confirmed that they have replaced the wireless card, hard drive and fan in the computer when my laptop was experienced other hardware related issues. They stated that there was no issue with the motherboard even though i told them to replace it.

Now every time i play a video, or do anything at all that requires any sort of CPU processing, the audio will become dstorted and start making wierd warlbing sounds. Even just logging in, it does this. The computer will often slow down during these small intervals and it will stutter. Especially when i am watching a youtube video or anything of that nature. I very skeptical if this is really an infectious related issue. Also another thing is this same issue has not only resurfaced on this lapop, but on my desktop as well. My desktop i have just recently rebuilt with all new components and parts. Now the thing about this is, this issue was never a problem during prior default Windows installation, but once I started installing all of my software, running programs and things like that, it sudeenly started having that issue.

 I am almost thinking that it might possibly be a codec issue, cause i do use video codecs to run certain videos at high bitrate's. The codec that i use is called KCP codec pack. Though i don't know why it would be a factor consdiering ive used it for years and this was never an issue before. How ever i have uninstalled the codec pack as a test, but the problem still persists.

So if you can determine exactly what the cause of this is or just forward this topic to some who can, i would appreciate it. Both of my machines are experiecing this same exact symptom and its hampering my ability to watch video's on my computer or just stream and do simple browsing.

EDIT: Hmm it appears i found a simlar topic to this and yes this is exactly the same related isssue, only this time its not just my desktop, its my laptop as well. http://forums.whatthetech.com/index.php?showtopic=128469

It seems to me like google chrome was what caused the problem and now both my laptop and my desktop are running firefox this time around, but appears the problem has resurfaced on both machines once again.

If the problem occurs on both of your computers, and only after you started installing all your software - then you need to go through a process of elimination and determine which software is causing the problem.

Based on your description of the problem and events leading up to it, there is nothing wrong with the hardware on your system, nor would I suspect any driver issue.  It seems pretty apparent the problem is the result of something you installed.  

By looking at your installed programs and sorting by "Date Installed," you should be able to identify what you have installed and when, and compare that to the approximate time the problem started.

You haven't provided any details about your computers or operating systems, or other installed programs, so I have nothing else to go on.

Either that or a browser or possibly extensions or plugins. I am going to try and reboot my machine into safe mode and see if i expeince the same sort of stuttering and audio distortion. If i do not then yeah you are probably right, its something i installed that is conflicting with windows.

Honestly it almost sounds like a memory overload issue. Because why would it be stuttering when i log in?

EDIT: Ok well i treid going to safe mode, but there is no way to test it cause you can't run audio on in safe mode. I tried following this tut http://superuser.com/questions/354325/how-to-enable-audio-in-safe-mode and created 3 new keys in the registery to see if i can get the audio to work in safe mode. But it still returned the error message. So i am not sure how to diagnose this problem. With out some how being able to isolate the issue, besides just uninstalling everything.

EDIT 2: Ok so i found something out, apparently after doing a full reboot, the machine is running fine, no stuttering and no audio distortion. I tried loading a youtube video, well loading other pages and no issues what so ever. This makes me believe that its deffinitly some kind of software or something installed on the machine and after the computer runs for a while, maybe that certain application causes an overload of memory? Possibly. I am just speculating, i don't know but its evident that its something running on the machine and not related to system drivers or hardware thats for sure.

Sorry, I did not realize you edited your post.  In the future, it would be better if you post a new reply for updates so that those that are following the thread know there has been a change.

In order to troubleshoot applications and services causing a problem you can use msconfig.  No need for safe mode.

http://support2.microsoft.com/kb/929135

Use msconfig in your process of elimination to selectively enable services and startup items until you narrow it down.  In your case, it may take some time, as the problem is intermittent.  You may also use task manager to start killing processes that might be causing issues in an effort to find which one is causing the trouble.  Task manager will also show you the memory and CPU usage of each process, so if that is a problem the offending process should be apparent.