I would definitely try reinstalling the driver then. The one on the disc that came with the card would be best. Some makers tweak the drivers for there specific card. The "off the rack" drivers usually work, but occasionally they can cause issues.
Also for future reference, PowerColor is not the best of cards. If you buy an AMD based card again, look for Sapphire or MSI. If you buy Nvidia, look for EVGA or MSI.