The System Scan will not open to scan.

I am able to update, immunize, Rootkit Quick as well as Rootkit Deep scan.
I am also able to access my logs, everything but do a system scan! When I click to open the system scan, the scan icon appears in the notify tray and does not appear on my desktop. The scan will not start or appear on the desktop and there is no activity reported by the task manger. I have even uninstalled and re-installed to no avail. Anyone have any idea how to fix this?

Thank you