Ok. What you have to do is go:
Start > My Computer > C: drive (local Disk) > WINDOWS > system32 > drivers > etc > At this point you will see a file called "host" "right-click" on this file and choose "rename" - Rename the file "host bad".
After you have renamed the file, log off, then log back on.
I do this for people all the time, so I know it works.
Hopefully, it works for you.
Acendo...