1. Open a browser, click Tools → Manage Plugins, and disable all suspicious plugins, or you can know exactly what to keep. Then → Tools → Internet Options → General Page → Delete cookies→ Delete Files → Check Delete All Offline Content → OK → Set the used disk space to be less than 8MB (I use1MB myself) → OK → Clear the history → The number of days the webpage is saved in the history: less than 3 → Apply OK (the setting I use myself is "0" days).
2. Restore the default values of browser advanced settings: Tools → Internet Options → Advanced → Restore the default settings.
3. The method to restore the default browser "Tools" → Internet Options → Programs → There is a "Check whether Internet Explorer is the default browser" at the bottom. Check the previous tick and confirm.
4. Set the homepage: Tools → Internet Options → General → You can change the homepage address → Enter your favorite websites → Apply.
5. If the browser is poisoned, use Kaka Assistant version 4.0 to repair it, and then do plug-in immunization: full inspection → immunization. Then → uncheck all items → find the required items, uncheck the available plug-ins again → cancel immunization. You can use FLASH and a few players, and the rest should not be immune. After all the operations are completed, your browser will be fine.