have Sony vaio laptop[pcg 71kl vgn fj 290p]. used internet explorer for year or so. then switched iso's from people to microsoft AND also downloaded mozilla foxfire. after two weeks of using both ie & mf,now can't get on internet using internet explorer.
receive messages: check isp address AND check firewall settings for
http port 80, http port 443, ftp port 21.
have looked at isp address on control panel/internet options/home. it reads, about blank.
i have no clue how to check firewall settings for ports.
HELP.

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