To make Ask your default search engines in Internet Explorer, open the browser first. Click on the down-arrow button next to the search button and click “Find more providers...”. Click the "Use current" button in the homepage section of the "General" tab. Click on Ask.com in the "Web Search" column. Check the check box next to "Make this my default search provider" and click the "Add Provider" button.
To make Ask.com your default search engine, you need to make it your homepage on your computer. To do this just go to the tools tab, go to options, and then click on the tab that says main. From there you should be able to type in ask.com and set it as your new default homepage.