Some of the graphics driver does not support screen rotation model of the machine, what software can do 90-degree rotating screen, before charges are PowerStrip is shareware, however, there is free software can achieve this effect you? Mentioned in the Group of Kai iRotate this small software, support multi-drive, adaptability very strong, good results. After installation, Ctrl+ Alt+ up and down so you can quickly rotate the screen up.

irotate\下载安装说明.txt
.......\屏幕旋转 irotate\屏幕旋转 irotate.exe
.......\屏幕旋转 irotate
irotate

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