When Internet Explorer 9 is used to view Web Pages on the internet, the IE9 window might not open under full screen mode. For a good view of the webpage it is required to press the F11 key on the keyboard which opens the window in the full screen mode. The above solution is a one-time action. But for viewing the browser in full screen mode by default it is required to click the 'Start menu' and type 'RegEdit' in the Run window before pressing Enter. It is then required to follow the path HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main and type 'yes' in the input field and click 'OK' to resolve the issue.
To view a webpage in full screen mode under IE9, you can use the F11 key on the keyboard. But if you want to start your browser in full screen mode by default:
Open RegEdit via the Start menu: type Regedit in the Run window and then press the Enter key
Select the following: HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
Search for the Fullscreen value.
Double-click Fullscreen, enter yes in the input field and click OK.
At the next startup, IE9 will open in full screen mode automatically. If you want to switch back, simply change the value to no.