If you're running the 32-bit OS, the program files folder will be just "Program Files".
If you're running the 64-bit OS, the default program files folder for 32-bit apps only will be "Program Files (x86)". For 64-bit apps, it will default to "Program Files".
Unless your friend has already done the FSX install, do him a favor and suggest that he not install it to the Program Files folder location. Rather, choose another folder that Windows UAC doesn't have control over (such as C:\Flightsims\...). This makes later tweaking much easier and prevents a few hiccups with some programs (like FSPanelStudio) that modifiy FSX files.
Moving this thread down to the Software Support forum.