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Because the problem is not in the parameters controlled by the TCP program. Your problem is almost certainly in your ADSL connection. It used to be good and your PC was using the same TCP settings. Login to 192.168.1.254 ID admin PW admin, or search for the default IP address, ID & PW on the net, and look at your downstream S/N numbers AND at the actual downstream speed which is negotiated between your modem and the DSLAM. The MAX allowed is what you paid for (3MB/s) often written as kb/s within the DSL section of the modem's web interface. Multiply by .85 to account for overhead, depending on the modem. S/N changes, going down as the speed goes up for the same signal level with problems beginning to occur at ~ 6db. What I wrote above is approximate. There are good articles about ADSL on the net if you wish more exact info. Below is my connection, though it's in Spanish since I live in Mexico. I translated part of it. Line has been active 38 minutes. Windy days cause connection to drop. I live 3.1km from the DSLAM so though I pay for up to 10mb/s (Telmex min speed) I can only get 3.5-4 reliably. Velocidad de línea ascendente (kbit/s) 383 upstream speed (limited by contract, and programmed into DSLAM) Velocidad de línea descendente (kbit/s) 3646 downstream speed (programmed into DSLAM by agreement with Telmex) Máximo ancho de banda ascendente (kbit/s) 1139 MAX up speed line will support Máximo ancho de banda descendente (kbit/s) 10200 MAX down speed line will support Estándar de línea ADSL2+ as speed increases line standard changes GMT, ADSL, ADSL2, ADSL2+ Tipo de canal Interleaved Relación señal ruido (ascendente dB) 29 S/N up Relación señal ruido (descendente dB) 12.9 S/N down Should be >6 @ 3646 kbits/s Atenuación de línea ascendente (dB) 27.9 Atenuación de línea descendente (dB) 44.9 Potencia de salida ascendente (dBmV) 12.2 Potencia de salida descendente (dBmV) 18.9 CRC ascendente 0 CRC descendente 8 Cyclic Redundancy Check of downstream connection FEC ascendente 0 FEC descendente 31869 Forward Error Correction of downstream connection Nombre de la Tarjeta Broadcom Brand of card in the DSLAM Retardo de Interleave(ascendente) 4 Retardo de Interleave(descendente) 8