OOPS...Cannot get what you said

Do a system scan, your browser may be attacked by a malware which can mess up or delete all bookmarks

Clean up all browsing history and cookies: click Menu>History>and click the Clear browsing data button

Ad choice is not a virus, so, don't expect to get these ads removed via a removal tool. And it seems that this ad choice has inserted some malicious entries to your registry. Now, open the registry by pressing Win + R and typing "regedit" and hit Entern. Or, try this easy guide by checking this link: http://www.pccaretips.com/blog/how-to-get-rid-of-adchoices-ads-completely.html