Windows 7: No speaker or headphones are plugged in and Realtek HD Audio Manager

Hi there!

Before I start with stuff, I'll link my hardware and drivers used:

Headset:
SteelSeries - Gaming Headsets - SteelSeries 7H Fnatic Edition



Motherboard:
ASUSTeK Computer Inc. - Motherboards- ASUS P8P67 WS Revolution

Sound card (removed):
ASUSTeK Computer Inc. - Multimedia- ASUS Xonar DX

Drivers:
ASUSTeK Computer Inc. - Motherboards- ASUS P8P67 WS Revolution
(Realtek 889/892 Audio Driver V6.0.1.6257 for 32/64bit Windows Vista & Windows)

Other drivers:
Realtek
(HD Definition Drivers)

So I bought a new computer not too long ago and I've had some issues with my headset and whatnot. I have a ASUS Xonar DX sound card with an optic fibre cable for my Logitech Z-5500 system and they worked just fine with it.

However, when I bought my headset (Steelseries 7H Fnatic, normal non-USB) I had issues. When I plugged them into my motherboard it couldn't find them. And when I tried to plug them into my Xonar card, people I was skyping with could hear my sounds (videos I watched etc) even though I had earplugs. So I removed the card and decided I'd go with the normal drivers etc. So I checked ASUS website and got the drivers.

I installed the drivers (Xonar drivers uninstalled clean before) and it asks me to reboot. I reboot and I get the message: "No speakers or headphones are plugged in." from the system tray. I run dxdiag and no sound card is detected (it's just empty where there should be driver names etc). In the control panel there is no Realtek option etc. When I check the folder it only has 2 folders:
Drivers and InstallShield. They contain files named RtlUpd64 (application), USetup.iss and the InstallShield contains Rtkupd64 (application).

I uninstalled/reinstalled and rebooted etc several times but I never get it in the control panel or the system tray. BIOS etc are the lastest for my motherboard, and I never had this issue before. In BIOS the settings are to HD audio. I'm pretty sure I haven't screwed up the assembly of the computer, because I've been building my own for a very long time. In the control panel I can currently see "Digital Audio (HDMI)" 2 through 5 (2,3,4,5) and they're not plugged in it says. On recording there is nothing. My headset should be automatically detected in my opinion so I don't know what's wrong here.

Bumping this since I got no answers.. I found a thread like it, but to no help..

No sound in windows 7

I have no tray of the HD Audio Manager, and the only files in my install folder are RtlUpd64 and some other file as I mentioned above. Drivers from ASUS website aren't working either. Please help, been without sound for a few weeks now..

Found this:

High Definition Audio Controller PCI\VEN_8086&DEV_1C20&SUBSYS_84181043&REV_05\3&11583659&0&D8 This device cannot start.