The individual homepage cannot open

My computer before what with is VISTA system any homepage can open, my bedroom schoolmate uses XP cannot transmit the mail as well as the individual homepage is unable to open! Afterward I also altered to the XP system also to be now same as them, some people said that was our router has not moved, which master could direct me to thank! ~~
Had a look is your homepage has been intercepted, is forbidden to spring the window Has not related with the system, those who look at on you are what network, the telecommunication broad electricity?
Also had the possibility is the firewall forces out individual homepage IP.