If you have installed the Windows 7 operating system. On an empty space on the desktop right-click mouse and view pop-up menu.
Select from the options line of the "display Properties". Click on it and a window will appear in the "display Properties".
Here you need to locate the "advanced" tab and select the rotation angle of the image on the monitor.
Press "OK" and then "Apply" saving your settings.
Consider a situation when you have flipped the image after reinstalling OS (windows XP). To get started, try a simple combination of Ctrl+Alt+arrows. The picture may begin to turn arrows, respectively.
If not the option arrow, run an antivirus and check your computer for any infected files.
If after you scan the computer by antivirus software and remove them (if they were), the image is still rotated, go to "control Panel".
There, select the section with your videocard. Open it by double click.
This opens a menu card. You must choose the tab "Rotate display".
Set the normal position of the screen and click "OK" to save the result.
If you have a monitor for your home computer. Go to "device Manager". This can be done by clicking on "My computer", right-click, then select "Properties" and the tab "Equipment". There's a button opposite the label "device Manager" - click on it.
In the list that appears, select "Video" and click on it right mouse button.
In the appeared menu select "Properties" and try to change something in the settings.
If does not help, update the driver using the same menu.