Hi, I have a creative Sound blaster 5.1 PCI sound card. When I plug it in one of the PCI slots on my motherboard, windows freezes just after starting up and I have to press the reset button to restart. When I unplug it, everything works fine. Is it my power supply? I have a 550W PSU. My motherboard is Gigabyte GA-81915PL-G. Thanx.