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you can easily do this nomatter what os u r using, u can just go to the website of ur ISP provider, change the password there. than u can open connect to internet dialog box there u uncheck the option "Save Password", that's it. After that if someone wants to access internet thru ur computer he/she will need the password.
That's only valid if you are using dialup or an account that actually requires connection like that (say, PPPoE or PPP). I use cable internet access and I have never had to enter a password for internet access, save for accessing email.