The application cannot be started/updated under certain conditions
This is a known issue relating to Microsoft ClickOnce deployment.
Very occasionally (but sometimes more frequently on certain machines), the temporary files stored on the computer by the .NET Framework when installing applications can become corrupted. This will cause some or all ClickOnce applications on the machine to fail to start, or fail to update to the latest version on startup.
When this issue occurs, you will see a dialog box with the message "Application cannot be started. Contact the application vendor."
The easiest way to resolve this issue is to remove and re-install ContactsLaw on the affected machine. However, if this does not work, a more exhaustive procedure may yield better results:
Exit ContactsLaw if it is still running.
Uninstall ContactsLaw via Add/Remove Programs in the Control Panel. Note: There may be two entries for ContactsLaw, labelled "Loader" and "Application" - you need only uninstall the Loader entry.
If prompted, change the option from "Restore the application to its previous state" to "Remove the application from the computer".
Type the following into the Run command (Windows Key + R): rundll32 dfshim CleanOnlineAppCache
Navigate to your firm's intranet site, then download and run the installer for ContactsLaw.