My browsers (Chrome and Firefox) have been infected with some kind of bloatware. It messes with my home page, what search engine is used when I search via the toolbar, and adds a new search bar too. I've uninstalled both browsers and re-installed, the program finds them again and re-inserts the new home page . I've also hunted down the offending extensions, but it seems to not have worked. Avast shows nothing, this is just horrid spyware/bloatware, not a virus. How can I cleanse my internet browsers please? Any other anti-malware programs apart from Avast I should have installed?