Cannot download anything in IE-Vista x64-SP1

[grpprod]

Hi,

just installed Vista x64 SP1 over a fresh installation. Everything OK, except for one thing:

I can't download ANYTHING under IE7. Here is the message:

"internet explorer cannot download ..... from ......"

"internet explorer was not able to open this internet site. the requested site is either unavailable....."

any help would be appreciated