After you remove search protect from your computer you will need to reset your web browser's search provider. This depends on which web browser you use.
For IE: https://support.microsoft.com/kb/923737?wa=wsignin1.0
For Chrome: https://support.google.com/chrome/answer/3296214?hl=en
For Firefox: https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems