I have the same problems for windows 7 64bit U..... afd.sys blue page errors even said 00000000D1 thanks for letting me know it a network Lan card or a network problems i think it nvidia
driver and realtek PCIe GEB famly controller having conflicks so i went to the device manager and went to update
driver and search automatically for update
driver software and it went online and updated the network built in card from the motherboard the driver updated then i went in properties and went to power management and unclick allow the computer to trun off the device to save power and it fix my problems from gameing with BF BC2. thanks alot