all games blackout and crashes ,then pc restarts. no errors seen

[GaurangPrabhune]

all applications blackout and crashes ,then PC restarts. no errors seen . event viewer shows me critical error as " The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." other error logs are" Session "PerfDiag Logger" stopped due to the following error: 0xC0000188" also following 2 errors showed up error 1===========================

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