Sound Not Working At All After Clean Install Of Windows 7

I got a new computer custom built a few months ago, but it came with Windows 7 32 bit, so I decided to wipe it clean and install 64 bit, for gaming purposes.It installed fine, games ran a lot smoother etc, sound was working at this point.The sound still worked up until a few days ago, when the headset I was using had broken. I ordered a new one from Amazon and while I waited for it to arrive I thought I'd just use my phone earphones in my computer.Considering the sound worked, the same day on my headset, but didn't work with my earphones, I'm sure you can imagine how confused I was. Because the headset was only physically broken, the sound was still working through it, and it sounded perfectly fine and clear, but when I used my earphones it didn't work at all.After some looking around, I discovered that the Realtek HD audio manager wasn't even installed on my computer, even though the previous headset had worked.. which confused me even more.So I installed it, plugged in my phone earphones, and it still didn't work.At this point I wasn't too bothered, because I thought that maybe it was because turtle beach headsets had their own sound-card inside the box that controls the volume, so I waited.

Only to have them have the exact same problem as my phone earphones, they didn't work on my computer, at all. I done all the usual stuff, checked that it was the default device on playback devices, which lead me to the other issue, my computer hasn't even picked them up as a device. I thought it was okay though, because the headset (Turtle beach x12's) are designed for xbox, but are compatible with PC (Which I have confirmed by using a laptop, they work on that). My old headset (Turtle Beach Foxtrot) actually appeared in the playback devices as "Turtle Beach Foxtrot" which I set as the default device, but with this new headset, nothing appears, just "Speakers".I've re-installed the realtek drivers and manager so many times, trying different versions, I've updated my chipset, checked nothing is conflicting in Device manager (There are no yellow symbols on anything), I've made sure audio is enabled in Services, I made sure audio is enabled in my BIOS, changing it to AC97 instead of HD, also changed the settings in Realtek HD audio manager to AC97. I've made sure the ports I'm plugging the headset into are working, by plugging my mouse into the same USB port. I've tried plugging them into the back panel, tried every possible combination.I've even made sure that the old headset I used didn't have its own sound card, because I thought maybe the sound card had been disabled inside my computer.The only thing it points to, is something being disabled inside my machine, which I haven't checked yet, because I wanted it to be a last resort.