The Sony site has an update to their VAIO Update software that for some reason did not self-update on my machine, even though it was published prior to my updating my machine to Windows 8. I tried uninstalling VAIO Update using Uninstall A Program in Control
Panel, but it said it couldn't uninstall because VAIO Care was running, so I uninstalled that first.
Then I went to the Sony site: http://esupport.sony.com/US/p/model-home.pl?mdl=VGNNW270F&template_id=1®ion_id=1&tab=download#/downloadTab
If this is not your Sony model, go up near the top left of the page, just left of the photo, and click on "change model..." (on a label near the lower right of your laptop's display).
In the drop-downs, open up the category called Sony Applications (Various) and choose the latest VAIO Care Update. For my model, it was dated 10/29/2012 and 163.70MB in size, version 8.1.0.10120. Not sure if they have a different version for every different
model, but I doubt it.
Then go to the category called VAIO Update and download and install the latest VAIO Update Software. For my model, it was dated 11/06/2012 and 37.12MB in size, version 6.1.1.10250.
I haven't seen the VUDesktopToast.exe error since.