..quite unusual that an exe shows up that google doesn't find anything really useful about!
What brought it to your attention?
It sounds from this article about prefetch that at some point that exe was ran on your PC. I would therefore search your entire disks for that exe to make sure it isn't there, then you might want to just delete from prefetch.
Apparently you can delete all prefetch files as allegedly they can begin to impact performance.
As far as I understand, Prefetch simply holds recently used installation files. I also believe that CCIMSCN.EXE is part of Norton. Some worms try to disable it, but as long as your Norton AV is working properly I don't think you have a problem there.
I run a gaming clan and part of this means i scan for cheats. One of the members had this file which was highlighted by the cheat scanner. I dont believe it is a cheat but would like more info to confirm.