Hi Jeff,
Did you try "Retry"? If it failed as many as four times, could you post the VSMsiLog so that we can find detail error message?
The value of option "/showui" is not important, the application only check whether the option is existing.
In addition, there is a Troubleshooting steps of this error. http://msdn.microsoft.com/en-us/library/dd266793.aspx#EN32000
Best Regards.
Ruiz Yi
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
Sincerely,
Ruiz Yi