Old versions of Kaspersky needed a long time to update the databases with virus definitions. With the latest versions being released, this process has been vastly improved making it easier to update the application and a lot faster. The problem with corrupt databases is related to the applications itself. Re-install it and then update it again. Make sure to run the installation package as Administrator and everything should be fine. I have installed the application as well and it works normally, even if it's in the trial mode.