If Kaspersky Internet Security 2013 is installed on the computer and you upgrade Windows XP to Windows Vista, then after your operating system upgrade the following error may appear on the screen "Operating system version was changed since Kaspersky Internet Security installation. Please reinstall Kaspersky Internet Security."
In order Kaspersky Internet Security 2013 works properly after operating system upgrade, it is required to reinstall the application. To reinstall the application, perform the following actions:
Release of antivirus database updates (required to protect your computer/server/mobile device)
Providing technical support over phone / web
Release of patches for the application (addressing detected bugs)
*Installation under Windows 8.1 is not supported by the current version.
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