Vista

Microsoft's suicide attempt, after years of grueling research Microsoft's top engineers determined that combining extremely expensive OS prices, too many damn versions with all except ultimate being crippled in some way, shitty compatibility, an OS with a "pretty GUI" resulting in a resource black hole which in turn cost people more money to upgrade only to discover that despite upgrading to the largest amount of memory and most expensive Processor, that due to it's being modeled on black hole physics their computers are no faster than before, they also made sure to make it difficult to use and find things, included a user agony and cruelty infliction system(commonly known as UAC), and decided that to truly piss off admins that even when running as administrator you aren't truly administrator.