If your PC appears to be running slowly but has a good spec processor and plenty of RAM then it may be worth checking the graphics card.
My PC has dual core, 4Gb RAM with 22" widescreen HDMI monitor but I have been unable to play HD video clips from my new Canon 5D Mark 2 camera as frames kept dropping. Having replaced the graphics card today with a new ATI Radeon 3650 with 512Mb RAM it has made a huge difference. Images now display immediately when opening in Lightroom and video runs smoothly playing through Canon Zoombrowser.
So check your graphics card as first step! In Windows Vista the new card gets a score of 5.9 compared to a score of 2.2 for the previous nVidia 6200 model.
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