The irq_less... is a generic error message that points either to a hardware or software fault. If the original poster didn't change software configuration and bsods started appearing out of the blue, the culprit at 99% is of hardware origin.
The most probable causes are ram sticks gone bad, some times even the video card can get you bsod, and finally the motherboard could be dying.
To diagnostic put everything at default, forget about overclocking. Then do a memtest on the ram (not 1-2 hours, try running it over the night) and check back.
Visually inspect the motherboard for blown capacitators (sometimes low quality caps leak and you have to rma the motherboard).
For the videocard, clean the fan it has plenty of dust, high temperature could be one of the causes of the pc going bsod.
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