In-Stat reports OS not driving upgrades.
Demand for new PCs has not been affected "significantly" by the delay to Microsoft's Windows Vista and its subsequent release, reports In-Stat.
The worldwide PC market is still on track to sell 300 million units in 2009, according to the high-tech market research firm's latest estimates.
"A short-term rise in PC demand is anticipated with the recent release of Vista," said In-Stat analyst Ian Lao.
"System sales that had been waiting for systems pre-loaded with Vista rather than XP are expected to work through sales channels in the next two quarters. But these sales represent an offset from last year rather than new demand creation."
The In-Stat report found that corporate buying cycles continue to be the dominant factor in enterprise demand for new PCs.
Memory manufacturers are likely to see the most benefit from Vista, with an increase of over 20 per cent annually through the end of the decade.
The average consumer wanting Vista is more likely to purchase an entire new system instead of a system upgrade, In-Stat reports.