scan doesn't start always from dropdown menu

when i want to scan a file or folder and rightklik on it and then choose “scan with comodo antivirus” the scan does not always start. sometimes just that blue circle from windows can be seen for about a second where the mousepointer was and nothing happens. ???

It is probably crashing check C:\ProgramData\Comodo\CisDumps folder for any memory dumps.

The folder CisDumps is empty.