Need new sound card

Hi , i'm a long xp user that changed to windows7x64
I like playing my game son xp because the sound is not that good on windows 7, i have low volume, distortion, TBH is not the same experience,
I was wondering.
Seeing that many games are starting to support DX10 and DX11, i wonder if i change my soundcard, will i get the same audio that i had on xp?
here are my specs.

Intel i3 2100
hd 6670 1gb gddr5
Audigy 2 value
8gb ram
Logitech 5.1 speakers (i play 2.1 only or headphones)

So far i'm playing some dx10-dx11 game son 7 and the sound is not that good, compared to the same game son windows xp.
Hope to get some advices.

IF you replace the existing sound card with a latest sound card then it would have a better sound. I would recommend to confirm the prices before purchasing.

HT/Omega IS a good suggestion, just make sure the interface will marry up with what's on your motherboard.

I was very surprised to find out my HT/Omega Claro+ would not fit the newest x79 platform from Asus...the P9X79Pro did away with that type slot.

Most dedicated cards will do that have support for eax. As for the xi-fi xtreme audio, that one does not use the actual Xi-Fi chip. It uses an upgraded version from the audigy chip. You won't get much of it if you want any HD Video or audio. I for one use the Xonar DS. It performs admirably for music and hd video, and just as well for games. Need to confess though, i am not an avid gamer. I can vouch for it's sound quality in music and videos though.

Thanks for the advices guys, I'm not to picky about sound fidelity, But i do want high sound on my pc while using windows 7. TBH i found it amazing that there's a big difference in Xp compared to 7.
I'm starting to think this was done on purpose .
i'll tale a look at your recommendations.