Ok, from what I can find a few people say they have trouble fitting it into the PCI slot either they say it was very tight or the PCB of the soundcard was warped. Only one person I could find said they couldnt install it.
Have you tried to install it by taking your time, lay your PC on its side, have it well lit up and make sure everything lines up just right and apply firm pressure to seat it in place, if you feel like your pushing on it hard enough it may break and you have everything lined up perfectly, I would contact Newegg.com for an RMA.
One thing that can happen is that you dont line up the mounting plate on the back correctly and this will prevent you from being able to install the card.
If it just does not look like it will fit at ALL, RMA it for a new one.