This sound problem is gone after I restarted the laptop, but after some time, the crackling sound is back again. I have tried everything from updating the Realtek sound card driver, using extra computer speakers, to using an external USB sound card and still no luck. After discussing it with my friends, I found some methods to fix this problem. The following are some methods that can be used to eliminate the crackling sound problem on your computer:
Method 1 - Disable All Sound Enhancement
In some cases, this method successfully overcome the crackling sound problem.
Right click on the speaker icon on system tray > Select Playback devices
Right click on the default sound card > Select Properties
Check on Disable all enhancement > Click OK
The screenshot below is for a Realtek sound card, for Creative sound card click here
Method 2 - DPC Latency Checker
If the previous method does not solve your problem, then I recommend you to use the DPC Latency Checker. This small tool will detect if your computer has DPC latency problems.
Download DPC Latency Checker from this page:
http://www.thesycon.de/eng/latency_check.shtml or this direct link http://www.thesycon.de/dpclat/dpclat.exe
Thesycon's DPC Latency Checker is a Windows tool that analyses the capabilities of a computer system to handle real-time data streams properly. It may help to find the cause for interruptions in real-time audio and video streams, also known as drop-outs. The program supports Windows 7, Windows 7 x64, Windows Vista, Windows Vista x64, Windows Server 2003, Windows Server 2003 x64, Windows XP, Windows XP x64, Windows 2000. Thesycon
Open dpclat.exe, Excessive DPC latency is indicated by a red bar. If you have a crackling sound problem, you will see many red bars. Some device drivers on your machine behave bad and will probably cause drop-outs in real-time audio and/or video streams.
To isolate the misbehaving driver use Device Manager and disable/re-enable various devices, one at a time. Try network and W-LAN adapters, modems, internal sound devices, USB host controllers, etc. If you managed to identify devices with misbehaving driver, you may try to update the driver or disable it when you want to watch movie or play music on your computer to prevent crackling or popping sound problem.
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