ITunes 12.0.1 doesn't install correctly

I was running iTunes 11.4 perfectly fine and then I updated to 12, but when trying to open it, it just says "iTunes was not installed correctly. Please reinstall iTunes. Error 7 (Windows Error 5). I have reinstalled plenty of times over the course of 2 weeks. I tried uninstalling every Apple program in a certain order and reinstalled, but with no prevail. I also tried deleting a certain file in the iTunes folder too. Please help.

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
tt2

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