You can remove third-party software with Microsoft Windows standard means:

• For users of Windows XP.
• For users of Windows Vista.
• For users of Windows 7.
• For users of Windows 8:

1. On the start screen right-click free space.
2. On the panel that appears at the bottom of the screen click the All apps button.

3. In the Apps list find the necessary software and right-click it.
4. On the pop-up panel click Uninstall.

5. In the Programs and Features window select the program you want to uninstall.
6. Double-click the program name.
7. The uninstallation process will start.

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 2011/2012 products 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. In order to resolve the problem, you are required to fully remove a third-party product. In order to do so, use the corresponding removal tool:

• Norton products uninstallation:
  • how to remove Norton software
  • tool to remove Norton products (NORTON REMOVAL TOOL (С) Symantec Corporation. Distributed under the terms of the NORTON Software Tool Usage Agreement)
• McAfee products uninstallation:
  • how to remove McAfee software
  • tool to remove McAfee products (MCPR (C) McAfee, Inc)
• Trend Micro products uninstallation:
  • how to remove Trend Micro software
  • tool to remove TrendMicro products (TISSUPRT (C) Trend Micro, Inc)
• BitDefender products uninstallation:
  • how to remove Bitdefender software
  • tools to remove BitDefender products (BITDEFENDER UNINSTALL TOOL (C) BITDEFENDER)
• Avast! products uninstallation:
  • how to remove avast! sofware
  • tool to remove Avast products (ASWCLEAR5 (С) ALWIL Software)
• AVG products uninstallation:
  • how to remove AVG software
  • tools to remove AVG products (AVGREMOVER (C) AVG Technologies):
    • for 32-bit systems
    • for 64-bit systems
• ESET products uninstallation:
  • how to remove ESET software
  • tool to remove ESET Nod32 (ESET UNINSTALLER (C) ESET, LLC)
• Agnitum Outpost products uninstallation:
  • how to remove Agnitum Outpost software
  • tools to remove Agnitum Outpost (for Outpost 2008/2009) (CLEAN (C) Agnitum Ltd):
    • for 32-bit systems
    • for 64-bit systems
• Norman Virus Control uninstallation:
  • how to remove Norman Virus Control
  • tool to remove Norman Virus Control (version 5.x) (DELNVC5 (C) Norman ASA)
• Tool to remove all entries that were created by Antivir in registry (REGISTRYCLEANER (C) Avira GmbH) 
• Tool to remove all entries that were created by Microsoft OneCare (ONECARE CLEANUP TOOL (C) Microsoft Corporation)