Really, we are missing something, let's summarize :
1 - You have I:R and other Steam games installed
2 - The file of these games cannot be found in the filesystems (at least not in the directories where Steam says the games will be installed )
3 - For me if the basic game files cannot be found there are just two possibility :
- - a) the game is NOT installed , Steam fails at doing this for some reason, so we are struggling to make a "not existing game" running..
- - b) the game is installed somewhere, but for some permission problems we cannot see it
Let's try a different approach.
You say that Steam installed other games and they run. Where they are installed? Steam usually store all the games inside "steamapps/common" . Where are the files of these games? A chance is that if all is caused by a permission problem, the I:R files are near them .
(BTW , you can just check with a "ps" where a process is running program from )