More than 1bn PCs will be in use worldwide by the end of 2008, said analyst Forrester, with the number exceeding 2bn by 2015.
The growth is being driven in emerging markets and high-profile programmes to reach previously untapped markets, said the analyst.
While it took 27 years to reach 1bn PCs, Forrester says it will take only around five years to reach the next billion, due to advancing technology, lower prices, and global demand from a technology-aware population.
According to Forrester, emerging markets in Brazil, Russia, India and China will account for more than 775m new PCs by 2015.
Forrester analyst Simon Yates said, "The industry can probably survive selling incrementally better hardware and software to the people who already have technology in their lives, but the vast majority of growth in the PC and related industries will come from emerging markets."
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Forrester website: http://www.forrester.com/rb/