Press Windows + R, type “ %programfiles%” in the dialogue box and press Enter. But there are some rare cases where residual files are left which may cause problems when you install the newer version. Most of the time iTunes is completely uninstalled using the procedure above.Note: On some systems, iTunes might install two versions of Apple Application Support. If you prompted for a restart after each uninstall, restart your computer immediately before uninstalling the next component. Not doing so may produce undesirable effects. Uninstall the following programs in this order. Here all the programs installed on your computer will be listed accordingly.

Press Windows + R, type “ appwiz.cpl” in the dialogue box and press Enter.Hopefully, the error will not pop up again. Click on “Help” present at the top of the window and click on “ Check for Updates”. Now open iTunes and log into your account.Check the option which states “ Allow software to run or install even if the signature is invalid”.Now scroll down until you find the “ Security” category. Once in internet options, navigate to “ Advanced” tab.Press Windows + R, type “ inetcpl.cpl” in the dialogue box and press Enter.Note: You should always turn this feature back on after removing it as it might be dangerous letting your computer download anything without any checks. We will try changing the security settings where software will be able to download even if the signature present is invalid or outdated. If it is outdated or invalid, the download will not continue and the error message will pop up. Their digital signature is verified and checked. It seems that all downloads from the applications are screened by Windows before they are downloaded.

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