An entry in this field indicates the number of times, on a hardware level, the card received corrupt data. This corruption could be caused by a faulty hub, cable, or network card.
The best way to try to solve Cyclic Redundancy Check (CRC) errors is to do a binary division of the systems on the network to determine which system is sending bad data. Once you've done that, you can start replacing the hardware piece by piece. Because this error is on the receiving end, it's difficult to determine if the CRC is bad on a sent packet.