Cracking sound

[TkSilver]

The crackling sound generally comes from not running at a locked full speed but having little slow downs happen. As for the solution to this it depends on a lot of things you have not mentioned

Hardware specs of the laptop:
Game(s) you are trying to play that have the issue:
Screenshots of your settings are very useful (graphics, audio, and system [well the top half of system anyways]):

Also any other info that may be of use. Examples include if you are using 60 fps patches or any cheats in general, or anything you think might help.