Generally speaking.... a Soundblaster is not much of an upgrade from a realtek. They are both in the consumer gamer sounds category. You need a musical interface.
 
Some folks can get them to work but, you should have invested in something from Focusrite, M-Audio, Presonus, etc....
 
If it's returnable, I'd consider that, and get an interface that is built and designed specifically to do MUSIC and not games and such things.
 
Be sure it can run the native ASIO driver as well.

I hope you get this sorted but I can't help questioning your choice of sound card. You have a nice spec pc and a nice synth and you've gone and bought a general purpose "gamers" sound card to do music with.

Grum.

Edit: I was typing when the post above mine was posted...great minds etc..

I wasted 6 years trying to make one work, In the end you'll get it to "work" but you will always be plagued with timing and other issues. An Audio interface is the heart of all DAW systems.
$500 software does not work with $19 sound cards. 
Start shopping. :) 
 
And just so others know, Creative actually lies about having real ASIO drivers. 

the difference is I believe in money, the soundblaster is like 50 bucks tops(I think)
a good soundcard is 200.00+
 
but you need to think of it as an investment and also you spent all this money on a good computer, good keyboard, the software but forgot the most important part,...the soundcard.
you might be better of trying asio4all and returning the soundblaster.
 
I went through this very same thing a few weeks ago with one of my friends.
he bought the soundblaster and by the time I left his house he was using asio4all and returning the soundblaster.
 
 
think of a soundcard like an engine to a car. you have this awesome paintjob and mint interior but the engine is made of cardboard.
no offense of course, just an analogy.