MicrosoftÂ’s latest operating system, Windows 7, is on course to break sales records following its launch today. The online retailer Amazon said that it was the “biggest grossing pre-order product of all timeâ€, having overtaken the likes of Harry Potter and the Deathly Hallows and NintendoÂ’s Wii. Speaking at the launch of Windows 7 yesterday, Jeremy Fennell, Category Director at DSGi, which owns Dixons, Currys and PC World, said: “We have sold more copies of Windows 7 in three weeks on pre-order than Vista sold in its first year.†At midnight, queues could be seen outside stores as computers users...