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Error: uncaught exception: (failed UI_ASSERT)
http://www.vistaarticles.com/articles/249/1/Error%3A-uncaught-exception%3A-%28failed-UI_ASSERT%29
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Published on 12/10/2006
 
Error message when you try to install Windows Vista on a particular hard disk partition: Error: uncaught exception

Error: uncaught exception: (failed UI_ASSERT)

To resolve this problem, remove the partitions from the hard disk, and then run the Windows Vista Setup program to install Windows Vista. To remove the hard disk partitions, follow these steps.

Important These steps remove all the information from the hard disk.1. Use the Windows Vista DVD to start the computer.
2. At the Windows Vista installation screen, click Next, and then click Install Now.
3. Press SHIFT+F10 to open the command prompt.
4. At the command prompt, type diskpart, and then press ENTER. 
5. Type select disk number, and then press ENTER. In this command, replace number with the hard disk that you want to modify. For example, if you want to install Windows Vista on the first available hard disk, type select disk 0, and then press ENTER.
6. Type clean, and then press ENTER. You receive the following message:
DiskPart succeeded in cleaning the disk.
7. Type exit, and then press ENTER to exit the DiskPart tool.
8. Type exit, and then press ENTER to exit the command prompt.
9. Restart the computer, and then start the Windows Vista installation.