Installation Knime 2.7.1 32bit on w7

Hi Folks
here we go again. I hoped things could have changed with 2.7.1 (32) on my W7 PC, but it did not.I started to think that my AVIRA antivirus firewal settings could have some problems.
The connection with is still impossible so I cannot update and have to wait ages before the WARN in console "Tipps & tricks cannot connect to" give me the control back. Horrible.
I cannot work anymore. Any Tipp against antivirus or for proper firewall setting (usually antivirus disable Windows Firewall).
Thx for every info