Windows 8 reboots without a warning

Hi all,

I'm having troubles with my PC (Windows 8) since the first day of 2013 when I came to work as usual, opened Winamp to play a song and and when I double-click the file the PC suddenly rebooted itself, on Log On there was no Error Notify, no dump file, no nothing

and from that day I'm having reboots without a warning constantly, the next day still the same thing with winamp, after that the PC crashed when working in Outlook. Until the first reboot without a warning the system was working properly for more than 3 months

(Windows 8), I've tried other RAM modules, uninstalled Norton Internet Security, checked the CPU temperature - all good around ~38, removed my USB speakers (the only USB device attached to my PC), didn't used another PSU yet but I don't think it's a power

issue because it's a good PSU and no Hardware changes were made.

So, the crashes can happen anytime, but if I want the PC to reboot itself it will definitely happen when using Winamp, playing a song or just maximizing the window by dragging it. I'm a advanced PC user but I never seen such a thing before. Windows has all

updates installed and I installed the latest Winamp version.

Need some help with this one, thank you....

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