Well for me anyway. Just did an update today and the latest Realtek drivers
that Windows Update downloaded and installed buchered my adapter. I did a roll-back from Device Manager and all is good now.
Not sure what the dealio is but if anyone has had success with this update let me know.
I have a Gigabyte EP45-DS3R with RTL8111C chipset.
I reverted to drivers with a date of 2/26/08, version 7.2.1127.2008 but may check with Realtek directly soon to see what they have.