system error

hey guys…i am having problems with my pc…every often it turns off and says system has recovred from serious errors….n some trojan pop up's also shows infection in my pc..what is the best way to deal with it? i am trying to get deckards system scanner..but i cant seem to find newer…can somoene please tell me what should i do first? and how do i get hijackthis log file?

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