Ok so: C:\Windows\System32\drivers\etc is where your hosts file is.
Open it with notepad, then put in on a new line:
127.0.0.1 activate.adobe.com
This sets the adobe address to your loopback interface. So it thinks its contacting its server when actually its not.
If that doesn't work then you need an anti-virus or firewall which will allow you to deny photoshop from been able to go onto the interwebs.