I have bought the personal (home) version of this program but already installed on my computer is a business version put on by my ex computer guru. When I attempt to uninstall the old version it comes up with the dialog box: "Another application has exclusive access to the file '...\ESET Smart Security\Charon\CASE.NDB'. Please shut down all other applications , then click Retry." When I open Task Manager, the only application open is the install program! How do I get the old program off my computer as they're obviously not compatible?