But there's more going on than just a lack of interest in Microsoft's latest operating system.
The problem begins with the tablet -- a market dominated by Apple's iPad and to a lesser extentAndroid tablets. "When you buy a tablet you use your PC 25 to 30 percent less. That's what the research tells us," IDC's Bob O'Donnell -- one of the author's of today's report -- said in a phone interview.
"If I use [the PC] less, my need to upgrade decreases," he said, referring to the consumer market.
That doesn't mean consumers will stop buying PCs. It just means purchases will happen a lot less often.
"We are truly in an era of good-enough computing. People are holding on to their machines longer," O'Donnell said.
Plus, there is no incentive to run out and buy a Windows 8 PC right anyway. The average selling price of a Windows laptop is $599, but touch-capable Windows 8 PCs and hybrids average about $799, according to O'Donnell.He continued. "Eventually they do upgrade their PC, but they're going to wait."
"In the case of Windows 8, they'll wait until they can get a touch machine at a more reasonable price point," he said.
And here's another scary trend for PCs. Chinese consumers' apparent tendency to buy a tablet as their first "PC."
"The China [growth] numbers are off-the-charts low. Is it because those first time buyers are skipping a PC?"
If that is indeed a trend, things may get a lot uglier for Microsoft -- and Intel.