MacBookPro boot issue after iTunes update

MackBook Pro showing disc utility after iTunes Upgrade. Instead of restart, I am seeing disc utility.I am not sure if my data is safe if I choose reinstall option. Does it reinstall OS without touching data?

Sorry for the late update.
The issue was with the McAfee encryption agent. If you have it on your MacBook Pro and by any chance you need to reinstall/ upgrade the OS, it will not allow it. I was stuck in the situation where it prevented any re-installation or roll back. The issue was solved only when I could get the HD decrypted by McAfee support and uninstall the agent through their experts. Only when the agent was removed, I could upgrade the OS.
Thank you Gnomish8 for your response.
Thanks,
- Gaikwad GV

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