When you uninstall the third-party product from the computer using Microsoft Windows tools, the Program Files folder may contain remains of previous antivirus product versions. If the folder contains folders/files of antivirus applications, delete them.

Try to install your Kaspersky Lab product once again.

Follow the instructions below to remove BitDefender software. After you perform all the actions, BitDefender software will be fully uninstalled. In order to remove the software, use the uninstallation tool BitDefender_Uninstall_Tool.exe (BITDEFENDER UNINSTALL TOOL (C) BITDEFENDER):

1. Download the the utility BitDefender_Uninstall_Tool.exe.
2. Run the file by double-clicking it.
3. In the left part of the BitDefender Uninstall Tool window click the Uninstall button. Wait until the process is completed.

4. To successfully uninstall the BitDefender product, you will be asked to restart your computer. In the BitDefender Uninstall Tool window click the Yes button to restart your computer and finish the uninstallation process.

Try to install your Kaspersky Lab product once again.

If the remains of the earlier installed anti-virus software are deleted, or any other anti-virus software was not installed earlier, but you still failed to install your Kaspersky Lab product, then send a request to Technical Support via the My Kaspersky Account service. To your request attach report of the Getsysteminfo tool. In the request do not forget to describe the problem and actions which are required to be performed to reproduce the problem in all details.

You can find the info how to manage My Account in FAQ for My Account.