There's definitely some English language comprehension problem here.
I may be be being thick but what games are Sly(Sky?) 1, 2 and 3?
Do you mean they were installed on the Xbox hard drive using Dvd2Xbox and when you click on the UnleashX main menu Games some of those games you've installed aren't listed?
When you use the UnleashX File Explorer and look at F:\Games are those 'missing' ones listed there or not?