Data released by Microsoft shows that nearly half of all Windows 7 systems sold are running the 64-bit version, a huge increase from its take-up under Vista.
Microsoft's figures show that 46 per cent of Windows 7 users are running the 64-bit version, compared to 11 per cent running the higher level version of Vista.
Microsoft cites strong demand in the business market, particularly in the US, for the surge in support.
"The reason for the jump in transition to 64-bit PCs can be attributed to a few things. The first is that the price of memory has dropped over the past several years making it easier for OEMs to up the amount of memory in the PCs they ship," said Windows communications manager Brandon LeBlanc in a blog posting.
"And most major processors in PCs today are capable of running a 64-bit OS. There are also more and more compatible devices and applications for PCs running 64-bit Windows 7."
Sales in North America are particularly strong, said LeBlanc, citing a study by Stephen Baker at NPD which found that 77 per cent of PCs sold at retail in April 2010 in the US had a 64-bit edition of Windows 7 preinstalled.
He also mentioned another study by Gartner which estimates that 75 per cent of all business PCs will be running a 64-bit edition of Windows by 2014.
Boris the robot outed as man in rented robot suit
Mission will provide vital data about the performance of rocket, spacecraft, autonomous docking system and the landing system
The flight will take off from California's Mojave Air and Space Port and could happen as soon as 13th December
Earth was showered with heavy particles called muons, which could have caused mutations and cancer in animals