This version is uninstallable; it was an earlier beta version that had no uninstall feature. I have run the older version for at least a couple of months with no problems and I was able to upgrade using the above link; it even saved all my settings.
These days with kids learning computers at the same time they learn to walk and talk, who knows? Uninstall procedure = clicking start, settings, control panel, add/remove programs, Worldtime, remove.