Nostalrius Begins - Quality wow vanilla realm (1.12)

So i was trying to help my friend install Nostalrius, and once we installed the game, it was nowhere to be found. Funny thing is, if you try to install again, it shows that the folder is on the harddrive, yet nowhere to be found. If anyone has had this problem, please help.

1. Press the Windows keys on your keyboard
2. Type "Run"
3. Click the Run Desktop app that appears in the search
4. Type "appwiz.cpl"
5. Look down the list at the bottom. Is "World of Warcraft Classic" listed? If no it has not installed correct, so install it again. Try installing as an administrator see if that helps.

It also helps if you give some information about your operating system, hardware specs