Hello jon88 and mmanolio,
I've provided a link to a tool that will remove Start8 and Start10. After you've completed this process, simply restart and perform a fresh install with a new copy of the Start10 installer.
**IMPORTANT** Please save any open documents/work and close out all of your applications including browsers, the following tool will force a restart.
Please follow this link:
http://sd.stardock.com/zubaz/apps/Purge_StartALL.bat
Save the file to your desktop, right click it and select "Run as Administrator". (Example: http://screencast.com/t/Zv5LzdG8W8 )
You may be notified that Windows is protecting your PC. Select "More info" and then "Run anyway".
After this process has completed, log into your Stardock account to grab a new Start10 installer and perform a fresh installation:
https://store.stardock.com/myaccount/products
Please DO NOT change any of the default settings until you verify that the application is running as expected in its default state.
Please let me know whether this resolves your problem or if you have any additional questions.