Web browser toolbars, such as the Google, Alta Vista, and the eBay toolbars, are known as Browser Helper Objects - technically spyware. They are also provide functionality which is useful for some people. Here is a list of BHOs and the associated file names. You may click on the individual Browser Helper Objects name to be taken to the tool to remove them from your system.
Listed BHO's are tagged X for certified spyware/foistware, or other malware, L for legitimate items, O for 'open to debate' and ? for BHOs of unknown status.