Users who are unable to install iTunes may not have an administrator account, they may need to update their computers with the latest Microsoft Windows updates, or they may need to disable conflicting software that might interfere with iTunes installation. These are three top reasons that iTunes fails to install properly.
When installing iTunes, users must log on as administrator on the computer where iTunes will be installed. The computer being used must be up to date with all Microsoft Windows updates. Any software that might interfere with iTunes must be disabled. Msconfig can be used to troubleshoot for software interference. Users still experiencing trouble installing iTunes after ensuring the requirements above are met should search the Microsoft support website for additional assistance.