Cisco PIX Firewall Web connection problems.

I have a strange problem with my network configuration: currently I can
access everything on the network except port 80. Whenever I try and
connect to port 80 using any form of client (including Telnet) the
packet is mangled with the destination request sent to 209.87.208.60
(which is registered to ZoneLabs) and the source IP set to the web
destination IP address.

I have never installed any software by ZoneLabs although this laptop
came with pre-installed Norton Antivirus and my troubles seemed to
start after installing the Cisco VPN client software.

I've seen a number of posts where people have reported this problem
with Zonelabs software, but I have never installed this software,
consequently I cannot uninstall it.

I recently reinstalled the Cisco VPN software and web access returned
for about 15 minutes and then the old problem reasserted itself.

Does anyone have any ideas? I've tried fixing Winsock to no avail, and
have uninstalled Norton Antivirus ... nothing seems to work.

Thanks,

Paul Stancer.