AdobeUpdater.exe started to show an annoying empty dialog box each time I restarted the computer. It said the installation was not ready and I could continue it later. I found no way to clearing it or accessing the settings or stopping it from showing up again and again.
I tried installing the latest Adobe Updater 5.1.1 update to no avail.
Eventually I solved it by deleting the Updater5 folder (I have Windows Vista):