i just reformatted my hdd, and reloaded all the software/latest drivers for chipset/graphics card/everything on my dell inspiron 5150 notebook today. i'm getting extremely sluggish response during any type of gameplay! at first, i would get relatively smooth video with severe stuttering every 20 to 30 seconds, then i changed some drivers around and even the menus on most games are just consistently sluggish. along with the reformat, i replaced the hdd as well as my motherboard. the thing is, i've been using this machine for years without ANY such problem. any ideas?