Updating microsoft office in vista
First, make sure that your PC meets the minimum requirements of Office 2010.
In theory, it should be able to uninstall updates that related directly and only to that product, but things quickly get knotty when the updates could potentially be shared by other products that you may, or may not, have installed.
From the point of view of system stability, it’s safer to leave something in case you need it, rather than remove something hoping you don’t. Software engineers have put a lot of thought into Microsoft Update, as well as software installation programs.
In order to switch from Windows Update to Microsoft Update, you can visit this Microsoft site which works for all versions of Windows.
Another way to do it would be to launch Windows Update like you normally do and then click the appropriate link as indicated below.
Second, unlike Office 2007, Office 2010 is available in x64 and x86 versions but you can only upgrade from Office 2007 x86 to Office 2010 x86 only.