ww doesn't work / can't connect to weather.com

WW stopped working a few weeks ago. I hadn’t the time then to check it. Now it’s still not working and I noticed I can’t connect to weather.com. The page loads and loads but will never finish.
I turned off desktop firewall, proxomitron (local proxy for ad-filtering), hostfile but nothing helps. I tried firefox as different browser but no chance. It must be something in the os.
On my older machine on the same broadband router ww works well but not on my main machine.
Does anyone of you have an idea where I could look into this.
Thanks for any hint.


PS. os is xp full patched.