Lost my Program Files

[mal]

Hi ,im sure this is very simple but I cannot figure how to recover my Program Files on my hard drive.
The icon has just disappeared ,so I cant browse into it ,though I can access it from the explorer adress bar ,but I prefer to click the icon.
How can I see the icon again please^
(Vista)

 

[Yami]

Maybe it got set as hidden somehow? Go to Tools -> Folder Options -> View tab -> select 'Show Hidden files and folders'.