After installing ZCM several kiosk PCs took too long to log in users. I deceided to remove ZCM to see if that would help speed login up a little. After uninstalling ZCM login was faster, but when users hit ctrl alt del, the PC freezes with a blank blue screen and a mouse arrow. The only thing to do is hit the power button and reboot the machine. I reinstalled ZCM and ctrl alt del works again. Any ideas what might be cause this issue?????