Software of any nature that has the primary function of gathering data about an end-user. Data gathered maybe personal or in aggregate only.
Official
Description:
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.
Comment:
Bundled with screensavers from mvr.us.
NavExcel can download and execute arbitrary code from its controlling server www.navexcel.com (as an update feature).
Information
URL:
http://www.navexcel.com/
Manual
removal:
Go to Add/Remove Programs in the Control Panel, choose the 'NavHelper' and click 'Remove'. Restart the computer