Normally iTunes.exe is in C:\Program Files\iTunes
It's not there. I dont know if it ever was.
You can also get a desktop shortcut by opening the Start Menu, scrolling down the app list until you reach the iTunes Folder, open it, then right click on the iTunes shortcut there, then on More, and then on Open File Location.
There is no iTunes shortcut there.
This will open the location of the shortcut in Windows Explorer, you can then drag the shortcut to the desktop while holding the control key to copy it there.
I can see the iTunes tile in the start menu tiles. But I get a circle with a backslash in it when I try to crtl-drag it to the desktop.