These days when you install a specific software, during the installation you will be prompted for different promotions and offers specific software. You probably didn't read what you were installing that's how you got it. As a simple application please follow these steps in order to remove the it:
Start > Control Panel > Add & Remove Programs > Search for Driver Booster > Uninstall. Next time when you install another software, if something prompts you which looks like an offer, choose decline and it should be OK.