Block websites you want?

C:\windows\system32\drivers\etc
right click on HOSTS, Properties then uncheck "read only" if checked at all and close that window. Next double click on HOSTs, choose Notepad then enter this in the hostfile.
127.0.0.1 http://www.mypace.com/127.0.0.1 myspace.com127.0.0.1 myspace

Hit save and you are done. Its not fool proof but it will work for those whom don't know better.