The Download.com Installer securely delivers software from Download.com's servers to your computer. During this process, the Download.com Installer may offer other free applications provided by our partners. All offers are optional: You are not required to install any additional applications to receive the software you selected.
From Security Stronghold:
Delta Search Removal Tool will find and fully remove Delta Search and all problems associated with Delta Search adware. It will also remove all leftover keys in Windows Registry and leftover files on hard drive. Removal Utility has several scan modes and Live Support will help you to solve any issues connected with removing Delta Search Toolbar.