If you want to install a Kaspersky Lab product version 2010 on your computer, but you have installed another Kaspersky Lab product or third-party antivirus solution, then you are strongly recommended to delete all other installed antivirus solutions before you begin to install a Kaspersky Lab product version 2010.

In order to delete antivirus software, you can use the standard means of Windows:

• click Start - Control Panel - Add or Remove programs (for OS Windows XP)
• click Start - Control Panel - Programs and Features (for OS Windows Vista)

After you have uninstalled an application using the standard means of Windows, some folders and files of uninstalled applications may remain in your system. Check up the Program Files folder. If you find any folders or files of uninstalled applications, delete them.

Sometimes after removal of third-party antivirus software with the standard means and the computer restart some records may still remain in the system registry and prevent a Kaspersky Lab product from installation. If in registry there are any records of a third-party antivirus solutions, you will know it during a Kaspersky Lab product version 2010 installation.

Before the files are copied onto a hard disk the Setup Wizard scans the disk for software incompatible with Kaspersky Lab applications. Records in the system registry are recognized by the Setup Wizard as fully installed third-party software, even though the product was removed and is no longer installed on the PC. As a result Kaspersky Lab Setup Wizard asks to delete the detected incompatible software manually and terminates the installation process.

To manually remove a third-party product, use the corresponding removal tool.

• Tool to remove Norton products
• Tool to remove McAfee products 
• Tools to remove TrendMicro products: 
• for 32-bit systems 
• for 64-bit systems 
• Tools to remove BitDefender products: 
• for 32-bit systems 
• for 64-bit systems 
• Tool to remove Avast products 
• Tool to remove F-Secure products 
• Tools to remove AVG products 
• for 32-bit systems 
• for 64-bit systems
• Tool to remove all entries that were created by Antivir in registry
• Tool to remove Norman Virus Control (version 5.x)