Sounds like it may be the mother board fritzing out. Everything tied to the board seems wacky. The IRQL not less than equal etc... has showed up when I've had bad RAM plus youve got the memory management issue. Sounds like somethings going on the board for it to have issues in multiple places. Seems just too random to have all those issues at once. The board is related to all. Then again it may not be. Good Luck.