This was further complicated by seemingly endless User Account Control (UAC) popups, performance issues and widespread stability issues, in part due to poor driver support from third parties.
While Vista introduced a lot of improvements under its hood, many Windows users saw no reason to upgrade from XP and Vista never saw broad adoption. After the introduction of Windows 7, its marketshare dropped rapidly and these days it's used by fewer than one percent of Internet users. If you're still running Vista or, God forbid, a copy of Windows XP, on an Internet connected machine, you're recommended to upgrade to Windows 10 asap.