World-wide shipments of personal computers fell 13.9% in the first quarter, according to market researcher IDC, in the biggest decline since the firm began issuing quarterly numbers in 1994.

The grim estimate of 76.3 million units shipped is the latest sign that consumers are shifting their dollars to smartphones and tablets rather than PCs, while responses such as convertible laptops and Microsoft Corp.'s (MSFT) touch-oriented Windows 8 operating system haven't stemmed the cannibalization.

Indeed, IDC said that Windows 8 hasn't only failed to spur more PC demand but has actually exacerbated the slowdown--confusing consumers with features that don't excel in a tablet mode and compromise the traditional PC experience.

"The reaction to Windows 8 is real," said Jay Chou, an IDC analyst.

Business customers are also keeping their distance from Windows 8, Mr. Chou noted, saying that companies that used to buy new PCs every three years before the recession have pushed out their PC purchases to every four or five years.

Because of the negative signs, IDC said it may need to revise its worldwide shipment expectations even lower than its already-gloomy forecast of a 1.3% contraction for the year.

Besides factors affecting all PC vendors, IDC said, Hewlett-Packard Co. (HPQ) and Dell Inc. (DELL) have been affected by internal corporate issues. Rival Lenovo Group Ltd. (0992.HK), by comparison, has been able to maintain its shipments world-wide, and actually increased its results in the U.S.

H-P maintained its position as the world's largest PC maker, shipping nearly 12 million PCs. But H-P's shipments were off nearly 24% from the same time last year.

Not far behind was Lenovo, which ranked as the second largest PC maker with 11.7 million PCs shipped, roughly flat from the same time last year.

Dell, which has made headlines recently for grim financial troubles and efforts to take the company private, shipped more than 9 million PCs world-wide--down nearly 11% from the same time last year.

Apple Inc. (AAPL), whose products ignited consumer interest in smartphones and tablets, ranked as the third-largest PC maker in the U.S., shipping 1.4 million computers, a drop of 7.5% from a year prior. The Cupertino, Calif., company represented 10% of the U.S. market, IDC said, up from 9.4% last year.

IDC's data didn't include sales of Apple's iPad or any other tablets, nor any Windows-based computers whose screens can be detached from their keyboards.

Write to Ian Sherr at ian.sherr@wsj.com

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