For the last couple of days, I have encountered a weird error while opening iTunes 126.96.36.199: This copy of iTunes is corrupted or is not installed correctly. Please reinstall iTunes. (-42037). Normally, I never experienced any other error in iTunes, but this was something really strange.
I didn't know what to do with this error; but all of a sudden, I recollected that I could get some help from control panel of my Windows PC (this error occurs in Windows PC more often). So I opened the control panel and followed a few simple steps, and whoa! It worked…
So if you have met with similar issue, here is a solution.
How to Fix “this copy of iTunes is corrupted or is not installed properly” Issue
Step #1. First, open Control Panel.
Step #2. Now click on Programs.
Step #3. Next, click on Programs and Features.
Step #4. Right click on iTunes from the list. A menu will appear with three options: Uninstall, Change and Repair.
Step #5. Click on Repair.
The process of configuration will start with a message flashed: Please wait while Windows configures iTunes.
Rest assured that your data will not be damaged during the entire process. If you have experienced similar problem, follow this how-to and fix the issue. If you know any other method, please share.