What should i do if i cannot access the internet, Why is the data transfer speed slow – Sony VAIO VPCCW1 Series User Manual

VPCCW1FFX, VPCCW1DGX, VPCCW15FX, VPCCW1AGX, VPCCW14FX, VPCCW13FX, VPCCW1HGX, VPCCW1UFX, VPCCW1TFX, VPCCW1CGX, VPCCW19GX, VPCCW17FX, VPCCW1PFX, VPCCW1EFX, VPCCW1BGX, VPCCW190X, VPCCW19FX, VPCCW18FX