Original Title : Why????

Windows 7 was a great operating system.  Windows 8.0 worked fairly well, but not like Windows 7.  Can someone please tell me, Why would people take a perfectly good operating system and make it worst.  It seems as if Microsoft is going backwards again.  I installed Windows 8.1 the other day.  I think it's worst than 8.0.  I used to have Messenger on my Start screen, now it has disappeared.  IT WORKED; LEAVE IT ALONE!!!!!!