In Tasks i have CIS_{15198508-521A-4D69-8E5B-B94A6CCFF805}

CIS_{15198508-521A-4D69-8E5B-B94A6CCFF805} C:\ProgramData\cisB4BD.exe --PostUninstall {15198508-521A-4D69-8E5B-B94A6CCFF805}
What does it mean and can i delete this ?

It is more than likely no longer needed. To be on the safe side of things first choose to disable it: right click on the entry and choose to disable. Once you established CIS functions normally after you rebooted a couple of times you could delete it.