Ok so my brother is really pissing me off, he come into my bedroom and uses my computer (Dell Inspiron 1545 running Windows Vista basic with Intel Pentium) to get on all these porn sites when I'm not home (though it is a laptop I can't take it everywhere I go). I've asked him to stop using my computer to go to theses site since I've had to have my computer wiped 2 times in the last 6 months thanks to him and his porn but he won't stop (I don't mind him using it for other things but it seems all he knows that exists on the internet IS porn). I put a password on it but he went and told my mom that I did so and she made me take the password off (or she was going to have the internet turned off which isn't fair since I PAY FOR IT!!!) so here's my question is there a (free) way to block certain websites (by url) on Internet Explorer (version 7 or version 8 I don't remember which one I have) and on Mozilla Firefox version 3.6.13 (I'm not sure if the {insert choice words here} has figured out that Firefox is the Internet) so I would like to block the sites on it too just in case he does know what Firefox is.
Dell Inspiron 1545
Windows Vista basic
Intel Pentium
Internet Explorer (version 7 or version 8 I don't remember which one I have)
Mozilla Firefox version 3.6.13