FryHard

The ClickOnce uninstall string can be found in the computers registry in HKEY_CURRENT_USERS\Software\Microsoft\Windows\CurrentVersion\Uninstall\[random string associated with your app]\UninstallString. You can use it to uninstall a "lost" click once application.

How to fix the "The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine." problem: .... change you project to build as a 32 bit (x86) application ....