How can I permanently delete websites I have visited so there is no trace of them?

I want to permanently delete websites that I visited and make it so that nobody can ever come back and see that I was on the website or that something came from me. The thing is, I sent a text message to someone from my laptop for one of my friends. Her husband was cheating on her and she wanted to send an... show more I want to permanently delete websites that I visited and make it so that nobody can ever come back and see that I was on the website or that something came from me. The thing is, I sent a text message to someone from my laptop for one of my friends. Her husband was cheating on her and she wanted to send an anonymous text to the girl that he was married because she felt as if he hadnt revealed that he was married and she probably didn't know. My husband told me not to get involved in their situation, but having been cheated on before, I felt compelled to do it. I don't want him to snoop on my computer to find that I did indeed meddle, seing as to how her husband and my husband are friends. I don't want him to tell my husband that something is up and my husband turn to me to get answers. I would much rather tell a "small lie", (what is a small lie anyway) and take this little secret with me forever. Computer guru's, please weigh in.
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