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Windows Vista. *shudder*.
After Windows XP, the world's most popular and used operating system, Microsoft needed a new challenge. It wanted to bring security and eye-candy to a world that had been under attack all but constantly, every minute of the day. The web was full of malware, and frankly Vista did not exactly help the problem. It wanted to, but it was too bogged down with its own internal bureaucracy -- called "User Account Control".
But it broke too many hardware devices, and the security protection was nominal. It was slow and sluggish and sales plummeted. Until Windows 7 came out, many had suffered with the operating system, while many had reverted back to XP. The lucky ones hadn't upgraded at all.