When installing Bentley Map Enterprise V8i (SELECTseries 3) you receive an alert dialog box that says "A Bentley Map Enterprise V8i installation is detected on your system. You can only have one Map Enterprise V8i installed on your system. This install will now abort. Please first uninstall any other Map Enterprise V8i and execute this install again."
If you have a Windows 7 64-bit operating system, the problem may be a latent registry key on the system. Use Regedit and look in the HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node for a \Map PowerView, \Map, or \Map Enterprise key. When found, remove it.