PCWorld.com has put together a list of the The 10 Worst Windows Features of All Time. Check out the list below.
1

ActiveX Controls
***
2

In housing, The Registry is a risk management tool used by landlords as a screening mechanism for prospective renters
***
3

Windows Internet Explorer , commonly abbreviated to IE, is a series of proprietary graphical web browsers developed by Microsoft and included as part of the Microsoft Windows line of operating systems starting in 1995
***
4

Notifications
***
5

Messenger Service is a network-based system notification service included in some versions of Microsoft Windows
***
6

Windows Update
***
7

User Access Control
***
8

Windows Task Manager is a task manager application included with Microsoft Windows operating systems that provides detailed information about computer performance and running applications, processes, network activity, logged-in users, and system services
***
9

Windows Genuine Advantage is an anti-piracy system enacted by Microsoft that enforces Microsoft Windows online validation of the authenticity of several recent Microsoft operating systems when accessing several Microsoft Windows services, such as Windows Update, and downloading from the Microsoft Download Center
***
10

Windows 95 USB
***