Error: What To Do if Your Kaspersky Product Suddenly Stops Working If you receive a "Integrity violation," or "Invalid key file," or some such message, in which Kaspersky Internet Security, Kaspersky Total Security, Kaspersky Antivirus, or Kaspersky Free (for example, after installing the product ) use of. is done. Updating it or updating your operating system), this is a bug / mess that we already know and there is a solution for it. For more information, please contact Kaspersky support phone number at + 1-855-855-4384 To fix this problem, you’ll need to reinstall your security solution. Here’s how to do that: Make sure you have your activation key on separate media, be it a piece of paper from the product box, and e-mail in your mailbox, your My Kaspersky account, or somewhere else. If you cannot find your activation key, follow the instructions from this article. Uninstall the security solution. To do that, open the Control Panel, choose Prog...