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Firstly take out the iptables rules and set the cache up on your IE to test your client comps can use the cache. If that works try altering the iptables rule sligthly
Also I would change http_port to http_port 3128 to test it restricting the interface squid listens on is causing a problem
iptables -t nat -A PREROUTING -i eth0 -d 0/0 -p tcp --dport 80 -j REDIRECT --to-port 3128