software firewall not needed? test

i tested 3 online port scanners,

pcflank sygate shields up

first with zonealarm pro 5 ,with a total secure and stealth pc as a result. then without firewall same test, this time only port 25629 was open detected by pcflank,so the adsl modem shuts out most attemts. before i did this with my dial up connection ,then the results were terribly different,open ports all over the place so is a software firewall still a good idea? well i keep mine that's for sure, abe

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