I have used a program called ADwCleaner in the past to get rid of such annoyances:
AdwCleaner is a program that searches for and deletes Adware, Toolbars, Potentially Unwanted Programs (PUP), and browser Hijackers from your computer. By using AdwCleaner you can easily remove many of these types of programs for a better user experience on your computer and while browsing the web.
The types of programs that AdwCleaner targets are typically bundled with free programs that you download from the web. In many cases when you download and install a program, the install will state that these programs will be installed along with the program you downloaded. Unless you perform a Custom install, these unwanted programs will automatically be installed on your computer leaving you with extra browser toolbars, adware, and other unwanted programs. AdwCleaner is designed to search for and remove these types of programs.
AdwCleaner Usage Instructions:
Using AdwCleaner is very simple. Simply download the program and run it. You will then be presented with a screen that contains a Search and Delete button. The Search button will cause AdwCleaner to search your computer for unwanted programs and then display a log showing the various files, folders, and registry entries used by these programs.
To delete these unwanted programs simply click on the Delete button, which will cause AdwCleaner to reboot your computer and remove the files and registry entries associated with the various adware that you are removing. On reboot, AdwCleaner will display a log showing the files, folders, and registry entries that were removed.
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