This is one of the known issues which is documented in this hyperlink:
http://officebeta.iponet.net/en-us/products/FX101517941033.aspx#1
The issue is due to the installation of Visio 2007 Beta2 after installing
Office B2TR1. In order to workaround the issue, follow these steps:
1. Uninstall all Office2007 applications. If you face any issues in
uninstallation, use "MSI Cleanup Utility" [
http://support.microsoft.com/default.aspx?kbid=290301 ] and uninstall all
Office 2007 Beta applications [Office, Visio, etc].
2. After a system restart, clear %temp% folder; install Office 2007 Beta2
3. Then install Visio 2007 Beta2 [and any other B2 products that you
require]
4. After completing Beta2 installations, perform a system restart.
5. Then install Beta2TR versions of Office2007 , Visio2007 and other
applications.
Hope this helps!
Regards,
Jagadeesh. P