Are there running other security program running in the background? Try temporarily disabling them to see if that helps.
To suceesfully clean install use this
clean up tool after uninstalling CIS and rebooting . Then install CIS again.
To go an extra mile you can also check for remainders of previously uninstalled security programs as described in the following.
We are gonna take a look to see if there are some old drivers of your previously uninstalled security programs are still around. Go to Device Manager --> View --> show hidden devices --> now look under Non Plug and Play drivers --> when you see a driver that belongs to your previous security programs click right --> uninstall ---> reboot your computer.
When the problem persists make sure there are no auto starts from your previous security programs. Download
Autoruns and run it.
This program finds about all auto starts in Windows. This tool can therefore seriously damage Windows when not handled properly. After starting go to Options and choose to hide Windows and Microsoft entries, to include empty locations and then push F5 to refresh.
Now check all entries to see if there are references to your previous security program. When you find them untick them. After unticking reboot your computer and see what happens.