Please follow these steps :
1-Launch Internet Explorer browser and click the option Tools.
2-Choose the option Manage Add-ons from the sub menu that opens.
3-From the Manage Add-ons window, locate Ask toolbar and remove the check mark in the box for Enabled.
4-Select Search Providers. First of all, choose another search engine (Google, yahoo, Bing) and make it your default search provider (set as default).
5-Then select Ask Search and click Remove button to uninstall it (lower right corner of the window).
6-Restart Internet Explorer.
1-Open again Internet explorer, Click the Tools button, and then click Internet/option Options.
Click the Advanced tab, and then click Reset.
2-Restart your computer and reopen internet explorer, On the Tools menu, click Internet Options. Click the General tab. In the Address box, type the Web page address that you want for your home page. (www.yahoo.com)
C-Once you finish please :
1-Open settings and click/tap on the System icon.
2-In System settings, click/tap on App & features on the left side. (see screenshot below)
3-On the right side, Find ask search program then click Uninstall.
4-Restart your computer and check.
Let me know if you need further help please