Information and media group VNU is changing its name to The Nielsen Company. Among the changes to come along with the rebranding effort will be the launch of a new corporate Web site and graphic identity, the company said. The rebranding will be rolled out progressively by all of Nielsen’s units during 2007.Nielsen owns PERQ/HCI, which reports on advertising expenditures and content in healthcare journals in the US.Nielsen’s Business Media unit is the parent of magazines Adweek, Brandweek, Mediaweek and numerous other publications.VNU was founded over 40 years ago through the merger of two Dutch publishing companies. The company was taken private in 2006 after six private equity firms acquired it in a leveraged buyout for $9.85 billion.