Occasional Crackles When Realtek Audio Driver Installed

i built myself a new computer and it has an ASUS Rampage 3 Formula motherboard which has:SupremeFX X-Fi 2 built-in 8-Channel High Definition Audio CODEC

- Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking Audio Feature :
- X-Fi� Xtreme Fidelity™
- EAX� Advanced™ HD 5.0
- THX� TruStudio PRO™
- Creative ALchemy
- Blu-ray audio layer Content Protection
- Optical S/PDIF out port(s) at back panel

I install the Realtek audio driver software and i get access to all my cool EAX advanced HD, THX truStudio etc.. things on that list BUT i get crackling noises every now and again when playing music/games whatever.
However i uninstall the audio driver software and i get no crackling sound when i listen to music or such, but i cannot access any of the features anymore.Whats going on here? its not the speakers or headphones i use, they have been tested on multiple devices, this only happens after the audio driver is installed and the audio features are activated.

My PC spec is:

CPU: Intel i7 980 3.33Ghz 12mb cache 6 core
GPU: 2x GTX 460 1GB
MB: Asus Rampage III Formula
RAM: A-Data Plus v2.0 XPG 2GB 1866Mhz 8-8-8-24 x3 in triple channel
SSD: OCZ agility ~400-500mb read&write
HDD: 1TB 7500RPM WD caviar black

this is all brand new, i just finished building it all a while ago, so there is like no crap running in the background like viruses or unneeded programs.my speakers are just small desktop 2W speakers, and i also use iPhone headphones, i have tried using the front jack on my pc & the rear jack (one that says "front" and is a light green colour) i get the noises nomatter if its headphones or speakers.

if i chage audio drive to nvidea from my graphics card and plug speakers into audio jack on my monitor which gets the HDMI audio from the GPU i get perfect sound.Uninstalling Realtek audio driver makes my pc use a microsoft audio driver it must have default, but it sounds fine.i just cant do ANY of the audio features available from the motherboard without it. and i worry its not HDMI/cinematic surround without this?