As it boasts fantastic onboard audio for this motherboard, and you have added a sound card , presume you have switched off onboard sound in bios ?? Looking at specs for this board I think the spend on sound card was wasted, but hey ho. Strongly suspect they are conflicting, try taking out sound card and drivers and trying only on board sound with drivers for motherboard. Also make sure your connectors are in correct holes as you now have two choices, if using sound card presume it has it's own?
ps reformatting should be the very last resort, I have built many computers over the last thirty years and although problems like this are frustrating they are usually fixable without reformatting which is a pain in the arse. Calm down, go away and think about it, and above all note down on paper what changes you have made to resolve it. This is so you can go back to base and start again trying a different fix, if you don't you end up altering everything and don't know what you have done. Then go back to basics, just like an engine, in your case what sound things do you have, onboard, separate card, speakers, headset and how does your operating system blend these all together? Work in steps in a logical manner, above all write the changes down, especially in the bios. Worked for me every time, you'll get there. I have a separate sound card with it's own software, every time I switch on I have to configure in this software before I hear in game, despite hearing windows start up music.
Update :- presume you've tried these from manufacturer ? https://support.creative.com/kb/welcome.aspx
especially the general audio troubleshooting, I think you have the same as me, the manufacturers software is overriding windows and needs setting up, perhaps every time?