How to Get Rid of Sweetsearch.com Redirect?

Sweetsearch.com Identified as Security Threat by Impressions

1) Your search websites are always redirected to Sweetsearch.com regardless of your operating system and your browser;

2) When you check your browser homepage settings, you find it has been changed to Sweetsearch.com;

3) Your desktop background has been changed to the classic or another one that you are unfamiliar with;