Why does my computer always re-start their own?

Users questions: Recently my computer always starts his new (Internet time) had never happened, I think the virus should not, because every day I have to upgrade, and the system is not the result of vulnerability scanning, I at first thought is a system problem, and made the system from the grid of the plate, can still appear that such is As, I ask you master, my computer is where a problem (a problem that is not hardware, right?)? ? Thank you! ! Note: I compared the old computer, using the system or windowsME's probably because I know what reason, and as long as the one with the Thunder from Kai, how is this going on ah?
Experts answer: or disk inside which toxic, is not now trays can no virus ...
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