When you upgrade Office 2010 from BETA to RTM, you might get Error 1731 the source installation package for the product Microsoft Office Office 64-bit Components 2010 is out of sync with the client package as shown in this screenshot.
This is because there are still pre-release Office 2010 products installed in system. It could be BETA or RC version of Office 2010 products.
To get rid of this error, simply go to your Control Panel/Programs list and remove all Office 2010 products (including Visio, SharePoint Designer) listed with version lower than 14.0.4763.1000. Once all pre-release Office 2010 products are completely removed from your machine, you will be able to install Office 2010 successfully.