It may sound and appear legit but Windows Manager is actually an adware-type application. This adware will display unwanted ads in the form of pop-ups, fake software updates, discount coupons, banners, and the likes. Clicking these ads will send you to malicious websites to get money from you or infect your computer further. You may also unknowingly download potentially unwanted applications or PUAs when this adware is installed. Be wary because this adware might prevent you from changing your settings back.
Windows Manager is usually installed through bundled software without you knowing. You have to remove it immediately!