Constant crackling/static sound

Good day all,
I installed Windows 7 on a ASUS PRO 72 SL-7s115c T3400 4G, and probably since the beggining i have had this annoying crackling/static sound. It occurs when there is some other sound, like music playing,startup sound or any other. It can sometimes be quiet and not very noticible, but sometimes impossible to ignore. Tried tweaking the configuration, where there is cd/dvd sound Mhz and stuff, but even if I put it at simple CD sound its still there. I tried reinstalling my Realtek Audio Driver, but no luck. Maybe i missed something or didnt re/uninstall the driver right, PLEASE help me, its driving me looney.

Look over the multitude of posts on this problem here and see if anything in those apply or will work for you. You are not the only one to have this problem.