Note that many websites have their own advertising, unrelated to adware.
From The LaughNetwork, "The LaughNetwork software is a program that will automatically reset your start page to one of our custom homepages each time your computer reboots. This means that your homepage will be changed from what it was before you download our software. If in the future you decide you no longer want to keep our homepage as your default homepage you can uninstall our software and change it. By installing our software you acknowledge that your homepage will be changed and you agree to allow that to happen. On your new LaughNetwork homepage you will be shown content of our choosing and also advertisements of our choosing."