XPS 8700, Asus Xonar DGX sound card, no boot

Hi, I have an XPS 8700 desktop, and I recently purchased an Asus Xonar DGX sound card. After installing it, I turned on the computer, but it wouldn't go past the "Starting Windows" screen. When I took out the card, it turned on normally. How do I solve this problem?

The sound card plugs into a PCI express slot, which my motherboard has, and everything seems to fit properly, but the problem persists.

I have tried disabling the onboard audio from the BIOS, like I read on a forum topic, but still no luck.

Any help is appreciated