Software of any nature that has the primary function of gathering data about an end-user. Data gathered maybe personal or in aggregate only.
NavExcel is a search hijacker implemented as an IE Browser Helper Object. Address bar searches, attempts to connect to unknown servers, and all 404 page-not-found errors (even those whose sites provide custom error pages) are redirected to webservicehost.com.
Bundled with screensavers from mvr.us. NavExcel can download and execute arbitrary code from its controlling server www.navexcel.com (as an update feature).
Go to Add/Remove Programs in the Control Panel, choose the 'NavHelper' and click 'Remove'. Restart the computer