Taiwan's Acer Inc. has pledged to meet new challenges in the slowing PC market after it replaced its top executive amid forecasts for its sales to slow.

Stan Shih, Acer's founder and a board member, acknowledged smartphones and tablet computers have brought "a far greater impact on the PC industry than we had anticipated."

In a statement late Thursday, Shih says "I hope once again we can face the challenges with a new strategy."

The statement followed Acer's announcement that top executive Gianfranco Lanci had resigned over differences with board members about the company's future.

Last week the company said its first-quarter results would be worse than expected. Acer also missed its revenue target in the previous quarter.