To ensure that your Office 2010 installation works smoothly and efficiently, we recommend that before installing Office 2010, you uninstall any earlier versions of Office that may still reside on your computer. If you find that uninstalling these versions cannot be done effectively from the Control Panel, then use the Fix it tool. Be sure to use the Fix it Tool version that is designed for the particular Office suite (Office 2010 released/beta/trial versions, Office 2007, Office 2003) that you are uninstalling.  

Fix it for me
Office 2003 suites

To uninstall the 2003 Microsoft Office suite automatically, click the Fix this problem button or link. Click Run in the File Download dialog box, and then follow the steps in the Fix it wizard.

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Fix this problem
Microsoft Fix it 50416

 
Office 2007 suites

To uninstall the 2007 Microsoft Office suite automatically, click the Fix this problem button or link. Click Run in the File Download dialog box, and then follow the steps in the Fix it wizard.

FixIt Tool

Fix this problem
Microsoft Fix it 50154

 

Office 2010 suites

To uninstall the 2010 Microsoft Office suite automatically, click the Fix this problem button or link. Click Run in the File Download dialog box, and then follow the steps in the Fix it wizard.

FixIt Tool

Fix this problem
Microsoft Fix it 50450

 

For more information, see http://support.microsoft.com/kb/290301.