there's an option in kaspersky to deactivate the scanning @ NNTP traffic, its near the email option, i cant remember the steps that get your there but its a really simple solution, dont be alarmed. you just have to configure kaspersky to NOT SCAN NNTP.
I'm getting the same problem and it remains despite disabling nntp/email scanner in Kaspersky. Its only grabit that has the problem im fine with newsleecher etc.
had same problem. just switched to giganews and use norton and am getting 7mbs my max speed
You should try the Symantec Client (from the corporate package) instead of regular Norton cause it uses less resources if you're going back.