Nokia Software Updater is a Windows application by Nokia Phone Company that enables customers to update their mobile's device firmware to enjoy new functionalities. The only restriction is that this software is only meant for recent devices of Series 40 or S60; all of these from any Internet enabled broadband connection.
As of this version there is no support for the Windows Vista operating system due to developers finding compatibility trouble according to www.forum.nokia.com. This is an issue for a large portion of users because of the vanishing of Windows XP on all of the new PCs and who are currently on Vista as a result cannot update their phone's firmware.
So it is very easy just go the software update web site download the application for free, then install, next connect your phone and backup your files, finally update and let the program automatically detect you phone's model and restore your files.
Nokia has released newer versions which now contain support for Windows Vista, however you must goto their site for a full list of supported phones.