Windows 7 reboots ....without any notice...?

[h=1]Windows 7 ultimate restarting even after reinstalling windows?[/h] windows 7 ultimate restarting again and again after some span of time....... even after reinstalling windows...???

Windows i used to instalI is working f9 on other pc's ,it restarts without any notification,there is no problem in installing any other application or driver but mostly it gets restart when I hit the window logo button on desktop..... ?????? :(

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