I had recently updated my installation of iTunes to the latest version when I got this message when trying to launch it:
iTunes was not installed properly. Please re-install iTunes. (Error 7).
So I did a total uninstall using Revo Uninstaller, rebooted and tried installing iTunes again only to get the same message as before. So I looked up this error message online and I was taken to this page that had me double check my Microsoft .NET installations for errors, so I did and found no problems there. But iTunes still wouldn’t run.
By this time I was fed up with iTunes and decided to leave it uninstalled but from that point on, I would see this error message when starting up my computer:
APSDaemon.exe system error
ICUDT49.DLL is missing
Another search took me to this page that had the solution to the problem. Basically I had to remove everything from Apple from my Add/Remove Programs list and delete their folders under Program Files and Common Files. Again I used Revo Uninstaller to accomplish this since it’s able to remove leftover traces of these programs from the registry and hard drive. Afterwards I used CCleaner to do a quick clean of the registry, rebooted and was able to re-install iTunes without errors. Once again it’s working and I’m back in business with my 100GB music library completely intact.
What a mess.