I need to install DX9 to run a new flight sim coming out and was wondering about the merits of reformatting the HD prior to the DX conversion... I've got XP so I've been using 8 (8.1?) since I built my rig about 20 months ago... ASSUMING my machine is squeeky lean and mean right now, is there any merit to doing a DX9 upgrade AFTER a HD reformat or is this just a waste of time. Again, I know a fresh install is always preffered but assuming the rig is FINE NOW, can it make any difference in the way DX9 performs on my rig? I'd guess not but does anyone feel differently?