hit the refresh button
The easiest way is to download and install that program again. If you want to re-install the program, inform us which program was that and what do you mean by "refresh".
Press F5 every time you want to refresh the page
No reason.
F5
Gpupdate
There is NO Refresh button on the PC.. however, F5 can work as a refresh button in Windows Environment
There is no Windows 8.
A clean install is when you would have it turned on for the first time. There is nothing else there but windows stuff. If you want to 'refresh' your windows files, consider re-formatting
Windows 8 is commercial. You need to by a Windows 8 book.
There isn't any Windows 7.8, but if you were referring to Windows Phone 7.8, it cannot be updated to Windows Phone 8 (note that I did not say Windows 8 because Windows 8 is for laptops, desktops and some tablets).
Windows 8 is not released yet.....
Many internet windows and programs will have different buttons to manage the open windows. Buttons may include a file, edit, refresh, bookmarks, and tools windows.