Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
NavExt is a browser hijacker implemented as a browser helper object. Redirects the browser to the site www.search-space.com. Also file NavExt.dll is related to malware Coolwebsearch.