I have Kaspersky Total Security 2019 and I get a similar issue. My rootkit scan runs everyday all day, it takes me about 15 minutes everyday to stop this scan to use me computer. The attachment shows the last scan, it duration is 21 hours and 54 minutes. This just recently started this behavior. Is there a setting somewhere to stop this? I have all my schedules changed to manual now and I cannot find anything else to stop this from happening. I have not tried to uninstall and reinstall yet.