Related to Rt630x64.sys 8101E/8168/8169 NDIS 6.30 64-bit Driver from Realtek
You really should update to w in 8.1
Completely remove the current driver (or software) and install the newest driver available. For instructions on how to do that Read all about updating drivers here http://answers.microsoft.com/en-us/windows/wiki/windows_other-hardware/updating-a-driver/a5e6345e-af9b-4099-bef0-8d22254aa1c1?tm=1436753520149