By Eva Dou

TAIPEI--The chairman of Taiwan's Acer Inc., until recently one of Microsoft Corp.'s harshest critics, said on Tuesday that the "crisis" surrounding Windows 8 is abating as he tried to convince investors the personal-computer maker is recovering from two years of losses.

Acer Chairman J.T. Wang gave a very different speech at Tuesday's investor conference than six months ago when he blamed Microsoft for competing against Acer and other hardware partners by launching its own-brand Surface tablet and throwing the PC industry into uncertainty with its new operating system Windows 8. Microsoft on Tuesday said that it is making changes to its sales strategy and to its software to address user complaints with a coming update dubbed "Windows Blue."

"The sense of crisis is falling," the 58-year-old Mr. Wang said. "Even if they (Microsoft) are still doing the Surface, they do it cautiously and have become more considerate in dealing with partners in the ecosystem."

Acer, the world's fourth-largest PC maker by shipments, for years made its living primarily off low-cost notebooks and lacks the high-end research strength of some of its competitors. It has struggled more than its peers as the tide turned toward mobile devices and has seen its market share erode globally. Acer brought aboard a new chief marketing officer this year as it tries to rise above its reputation as a maker of low-grade laptops.

Microsoft has been working more closely with Acer and other hardware makers in recent months, Acer's corporate president Jim Wong said. Besides the support that Microsoft gives partners for marketing, Mr. Wong said the U.S. company also ran a program to support development of certain high-end Windows 8 products such as Acer's Aspire R7 computer, a swiveling convertible laptop that the company launched last week.

Additionally, Acer is participating in Microsoft's program to develop more Windows 8 devices smaller than 11.6 inches, Mr. Wang said. He declined to give details as he said Acer will no longer announce products until half a month before they reach store shelves.

The company will continue rolling out lower-end Android tablets to drive shipments, after selling 1.2 million tablets in the first quarter, Mr. Wong said. The company forecast second-quarter shipments of mobile computing devices to remain flat or at best rise 5% from the first quarter.

Acer's PC shipments fell 11% in the first-quarter, while operating margin slipped to a razor-thin 0.03%, its lowest since the third-quarter of 2011, the company said Wednesday. First-quarter revenue fell 18.7% to 91.97 billion New Taiwan dollars (US$3.11 billion) from NT$113.06 billion a year earlier, its lowest level since mid-2006. But with the help of foreign exchange and stock disposal gains, the company's net profit rose 80.7% to 515 million New Taiwan dollars (US$17.4 million) from a restated NT$285 million a year earlier.

Kirk Yang, managing director at Barclays Tech Research, said that Acer is unlikely to gain market share in the near-term due to stiff competition, but profitability is gradually improving.

Acer said it operating margin may fall into negative territory in the second quarter for the first time in two years, before rising in the second half to between 0.5% and 1%.

Write to Eva Dou at Eva.Dou@wsj.com

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