You might get a trial version of Microsoft Office 2010 when you buy a new computer. If you don't want it, you can uninstall it using any uninstaller program you have. If you still cannot uninstall Office 2010 completely, then you might want to give this one a shot. It's called Remove Office 2007, which is specifically designed to uninstall Office 2007, yet it can also be used to remove Office 2010.
Just hit the "go" button and the application will totally uninstall Microsoft Office 2010. The computer will be restarted instantly after the removal process is complete. Then it will look for other traces of Office 2010 installation to make sure that there is no trace is left behind.
However,since this remover is intended for Office 2007 removal, there are stil certain parts of Office 2010 cannot be removed. The good news is you can remove them with another free utility called Windows Installer Cleanup. Simply select Office 2010 from the list once you run the program and click the "remove" button.