Java blocking websites

Re my recent post, Some websites wont open...

' I have a desktop (host), wirelessly linked to a laptop. I have a
Broadband
modem and a router, both the same brand, also I am running Windows XP
firewall. My home network operates fine and I am able to share the internet
and files etc. However when I go to a website although I can access the
website part of it I can't with my desktop but can with my laptop.

For example when I go to my local library and want to access my account I
can with the laptop but not with the desktop. I read somewhere how one
needs to open ports, could this be the problem?

I spoke to a couple of techs and one agreed and one didn't. One tech
suggested I use DMZ the other tech said no. I'm confused. There was a lot
more to the discussion some of which I grasped and some I didn't.'

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Could Java vers 5. update 9 have anything to do with this???

Sorry, but I am creating a new post as I felt maybe my last post will no
longer be viewed.

Many thanks all

B.W.