Turning comod firewall on solved my problem. it showed me that mediaportal installer was trying to acsess internet, and i let it pass.
Yes, I can access the internet good and fineDeployTool, our installer, is written in .NET as so will use the IE client to connect to internet.
As told by the error message, verify that you can navigate with IE itself.
BTW, are you asked a password for browsing internet ?
Simone