Q: Why I can't install iTunes on my laptop with Window 10 operating system

Did you download the correct and latest version of iTunes, from here

https://www.apple.com/itunes/

and then run the downloaded installer.

Do you have any anti-malware software installed and running in the background, that prevents third-party software installation?

Are you running in a user account that has administrator privileges?

http://windows.microsoft.com/en-US/windows-vista/What-is-an-administrator-accoun t

It's possible the Symantec software is still blocking access.

I don't know the specific cause.  Usually, problems related to iTunes being "blocked" happen after installation.  For example, Firewall settings blocking Internet access for iTunes.  Or iTunes unable to sync connected devices.  You can check this Apple document, in case there is a Firewall issue, but that seems less likely because this problem occurs during installation.

If your Windows firewall is blocking iTunes - Apple Support

Did you already have a previous version of iTunes installed on this computer?  If you did, you may want to try completely uninstalling iTunes and related software components.  This Apple document lists the components of an iTunes installation, and the precise order to uninstall them

Remove and reinstall iTunes and related software components for Windows 7 and later - Apple Support

After iTunes is completely removed, try installing the latest version of iTunes again.

Repair Apple Software Update from the programs and features control panel and then try again.

Otherwise 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 the page in case one of them applies.

The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for performance issues or compatibility with third party software.

Your library should be unaffected by these steps but there also links to backup and recovery advice should it be needed.

tt2