Why I can't rotate the screen of my tablet pc in windows7 when I press the rotate screen button?

There is sth. different for tablet PC's rotate button. Try Readmesoft rotate screen for win7 software.
Full functional. Free download.

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What can I do using Readmesoft Rotate Screen?

Rotate your screen by 90 degree, 180 degree, 270 degree, 360 degree. Tablet PC user always want it.

Free to use, full functional