I am having all types of problems with my computer HP Pavillion a1140n PX774AA. 1 suggestion was to remove duplicate devices. I do not know how many devices should be listed under each of the areas. For example I have 2 HP vs17 flat panel monitors listed and 2 listings for Intel(R) Pentium(R) 4 CPU 3.00 GHZ. How do you tell if they are duplicates?