Wireless PCI-E netowork card problems

I really need help with this, my wireless pci-e adapter, as of a matter of fact, the D-link xtreme n desktop adapter. The top of the back metal part get stopped by the case bracket where the video cards are. The stop the card from going in. I've tried 2 cards (wireless adapters) and they both don't work. Please help.

Thanks :)
 
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