By PETER SVENSSON | Associated Press

NEW YORK (AP) — The release of Microsoft’s Windows 8 operating system is a week away, and consumers are in for a shock. Windows, used in one form or another for a generation, is getting a completely different look that will force users to learn new ways to get things done.

Microsoft is making a radical break with the past to stay relevant in a world where smartphones and tablets have eroded the three-decade dominance of the personal computer. Windows 8 is supposed to tie together Microsoft’s PC, tablet and phone software with one look. But judging by the reactions of some people who have tried the PC version, it’s a move that risks confusing and alienating customers.

Tony Roos, an American missionary in Paris, installed a free preview version of Windows 8 on his aging laptop to see if Microsoft’s new operating system would make the PC faster and more responsive. It didn’t, he said, and he quickly learned that working with the new software requires tossing out a lot of what he knows about Windows.