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looks like folks have covered the most common causes but there is one other thing I would do as well. Run a chkdsk /f on the drive that houses your swap files. Sometimes irql not less or equal is driver\device related and others its a mem issue including swap files so if all else fails chkdsk it and make sure the disk is still in good shape.
I checked hdd and ram both tested good. Now I am getting a ATTEMPTED_SWITCH_FROM_DPC error.
Looking at the new error and the parts of the sys dump you posted it more and more points to a bad driver. I'd update all of your drivers to the current versions posted at the manufacturers websites and if all else fails posibly a fresh windows install may be in order. :(