I just made an account to leave you guys an answer (lol); well, here it is:
While your computer is turned on, your Windows account is logged in, and your Realtek Audio Manager is open in the Sound Manager window (the one that shows the Speaker Configuration), unplug the BLACK jack for your 5.1 speakers, then plug it in again. You will see a pop-up asking you what the device is, and this is where you can tell stupid Realtek that your speakers are in fact side speakers and not rear speakers!
I hope this helps!
Thanks man that worked!