Is it causing you an issue?
Google suggests that vmparport is the VMware Parallel Port driver which makes it possible to print from inside a guest OS through the host OS, and I guess that vwdk.installers is associated with how VMware install the components they need such as vmparport either on a host OS or in a guest OS.
Thanks for the reply scott28tt. No, it's not causing me a problem, but it seems to be in an unusual location! Doesn't MSI refer to a Windows Installer (which used to be called Microsoft Installer)? The vmparport service should be initiated by VMware, not by Windows. I may be wrong, of course!