After you remove Avast, some of its records may remain in the system registry and prevent a Kaspersky Lab product from installation. Make sure you fully remove Avast antivirus before installing a Kaspersky Lab product. Use the following guides:
To remove third-party software using Microsoft Windows tools, please refer to these instructions.
When you use regular Windows tools for removal, some files and folders of the previously installed software may remain in the system. We recommend that you check the Program Files folder for such files after removing software from your computer. If the Program Files folder contains any subfolders or files of the antivirus software installed earlier, please remove them. Then, try to install a Kaspersky Lab product once again.
Be careful, the content of any folder you choose will be deleted!
If you are sure you have completely removed third-party antivirus software, but you still experience problems installing a Kaspersky Lab product, please create a request to Kaspersky Lab Technical Support via My Kaspersky. Attach a report of the Getsysteminfo tool to your request. In the request, give detailed description of the problem and the actions necessary to reproduce the problem.
For information on how to use My Kaspersky, please refer to the Online Help page.
How to install Kaspersky Internet Security 2013How to install Kaspersky Anti-Virus 2013Step-by-step installation guide of Kaspersky PURE 2.0How to install Kaspersky PURE 3.0
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