Need help finding what's wreaking havoc on my laptop?

You uninstalled NVIDIA PhysX Card Drivers, and those drivers are mandatory on some ATi Cards. Anyway, PAGE_FAULT_IN_NONPAGED_AREAS indicates a memory error, as does MEMORY_MANAGEMENT. IRQL_NOT_LESS_OR_EQUAL indicates that a hardware component changed to or is conflicting with a different hardware component on the same IRQ (Interrupt Request). Anyway, i've encountered this problem on some systems with heating errors on the graphics card. Anyway, the problem lies with the graphics card. Try swapping it if possible, or return your system to the manufacturer and have them repair it. I would pick the manufacturer, as you don't want to void any warranty.