I have a new desktop pc that includes this controller. Upload speed is terrible. I have the most current drivers from Realtek. Hardwired to modem. Using Internet speed test..my old computer gets 1.87mb upload...my wireless laptop gets 1.87mb upload.....with this new computer using GBE controller I get 786kb upload. The download speeds are fine. Have powered on/off reset modem...so is not the issue. Must I use this controller? If I delete it will Windows controller take over?