dd1963AQW

Over the last month my mac has been failing to start up and has been so slow. The error log reflects that K I S is causing a problem. I unloaded it totally and ran the mac for a week with no problem. I have now reinstalled it and the same problem is happening - it just takes ages to boot up and then reboots what looks like back into safe mode then starts normally - has anybody any ideas or experiencing the same problem ? Scan is absolutely clear so no threats or issues there.