Computers running on the next version of Microsoft's Windows operating system "Windows 8" will go on sale in October.
New versions of Windows typically come out every three years, but this update is the most widely anticipated overhaul of the software since 1995.
Applications will appear in a mosaic of tiles on Windows 8. Microsoft also designed the operating system so it can run on personal computers or touch-based tablet computers.
Windows 8 is being counted on to help revive demand for laptops and other personal computers.
The operating system's versatility is expected to encourage leading PC makers such as Hewlett-Packard and Dell to release hybrid machines that are part laptop, part tablet computer. Both HP and Dell have also indicated they plan to release tablet computers powered by Windows 8, thrusting them into competition with Microsoft's Surface.
Microsoft is releasing Windows 8 computer manufacturers during the first week of August.