I have missing icons for Windows Live Games, and for Steam from valve. As soon as you can please fix with next update; please and thank-you IT staff.
What version of CC and Windows?
Are they missing from the desktop?
Do they still work from Start, All Programs?
Is it just those 2?
Did you run CC with any enhancements, INCLUDEs, default settings or with winapp2.ini?
Did you run the reg cleaner process?