I’ve seen a few cases where the DisplayLink driver installation program won’t run properly on Vista. Here are a couple things to look at if the basic ideas don’t work.

Before trying these things, make sure you disable security software (anti-virus, anti-spyware, etc.) As that may solve the issue by itself, and will also prevent problems with these next steps.

First, make sure the Windows Installer and Windows Module Installer services are running. Manually start them if they aren’t running and try the installation again. (This can be done from the Services tab of the Task manager).

If that doesn’t work the VBScript.dll may not be registered with the DLL service. The way to fix this is to have them open a CMD prompt window and run these 4 commands:

That last one will register the DLL. DisplayLink’s release notes show that if the VBScript.dll is not registered the program can’t run. After running that last command you should get a message saying the DLL was successfully registered. At that point you’ll want to try the install again. If for some reason it fails, there is going to be a bigger problem at hand. At that point you may need to have someone fix your windows install ;).