certain pages wont load

I have a machine running w98 se that wont load certain pages.
cbs.marketwatch.com quickdonations.com cnet download- in Netscape 6.2 it’s connection refused. In ie6 it’s unable to link to web page requested (currently unavailable).
The firewall is zonealarm pro with nothing listed on the event page pertaining to this.
Other browsers appear to do the same.
All windows updates are current.
java version is 1.4.1_01
otherwise, the computer functions perfectly.
I’d appreciate any response.