try a diffrent lead from p.c to router there very easily broke, try a diffrent port on the router also, if that doesnt work try a direct connection from the set top box to her p.c if it drops out may be a broken network card, if your dowloading fine from the wireless its ok. it wont be a i.p address problem as you get connection on and off it would work or it wont, does she get internet when your p.c is on the net?