De un tiempo a esta parte no me va muy bien internet, y al hacer un netstat (con navegador apagado) me sale esto:
C:\>netstat -n
Conexiones activas
TCP 127.0.0.1:1027 127.0.0.1:3080 ESTABLISHED
TCP 127.0.0.1:1027 127.0.0.1:3083 TIME_WAIT
TCP 127.0.0.1:1027 127.0.0.1:3085 TIME_WAIT
TCP 127.0.0.1:1027 127.0.0.1:3087 TIME_WAIT
TCP 127.0.0.1:1027 127.0.0.1:3089 TIME_WAIT
TCP 127.0.0.1:1027 127.0.0.1:3091 TIME_WAIT
TCP 127.0.0.1:1027 127.0.0.1:3093 ESTABLISHED
TCP 127.0.0.1:1027 127.0.0.1:3095 ESTABLISHED
TCP 127.0.0.1:1043 127.0.0.1:1061 ESTABLISHED
TCP 127.0.0.1:1043 127.0.0.1:1069 ESTABLISHED
TCP 127.0.0.1:1043 127.0.0.1:1075 ESTABLISHED
TCP 127.0.0.1:1043 127.0.0.1:1076 ESTABLISHED
TCP 127.0.0.1:1044 127.0.0.1:1079 ESTABLISHED
TCP 127.0.0.1:1044 127.0.0.1:1080 ESTABLISHED
TCP 127.0.0.1:1045 127.0.0.1:1077 ESTABLISHED
TCP 127.0.0.1:1054 127.0.0.1:1078 ESTABLISHED
TCP 127.0.0.1:1061 127.0.0.1:1043 ESTABLISHED
TCP 127.0.0.1:1069 127.0.0.1:1043 ESTABLISHED
TCP 127.0.0.1:1075 127.0.0.1:1043 ESTABLISHED
TCP 127.0.0.1:1076 127.0.0.1:1043 ESTABLISHED
TCP 127.0.0.1:1077 127.0.0.1:1045 ESTABLISHED
TCP 127.0.0.1:1078 127.0.0.1:1054 ESTABLISHED
TCP 127.0.0.1:1079 127.0.0.1:1044 ESTABLISHED
TCP 127.0.0.1:1080 127.0.0.1:1044 ESTABLISHED
TCP 127.0.0.1:2941 127.0.0.1:2942 ESTABLISHED
TCP 127.0.0.1:2942 127.0.0.1:2941 ESTABLISHED
TCP 127.0.0.1:2984 127.0.0.1:1027 TIME_WAIT
TCP 127.0.0.1:3032 127.0.0.1:1027 TIME_WAIT
TCP 127.0.0.1:3080 127.0.0.1:1027 ESTABLISHED
TCP 127.0.0.1:3093 127.0.0.1:1027 ESTABLISHED
TCP 127.0.0.1:3095 127.0.0.1:1027 ESTABLISHED
Esto es normal que son todas esas conexiones, pueden afectar a la navegacion,descargas etc...