XP system under How to lock the Internet Explorer?
1, open IE Browser, click the "tools" → "Internet Options."
2. In Internet options, click content → enable.
3, pop-up "Content Advisor" check "Guardian can type a password to allow users to view restricted content", and then click "Create Password."
4, enter the password, in order to prevent forgotten password can be in the "Prompt" window to enter "some content" in order to remember the password, finished press "OK" next pop-up "has successfully created the supervisor password."
5. When you open the IE tour again, you will be prompted to enter the password before you can enter the browser.