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Your pc does not meet the minimum requirements to edit HD videos in my opinion.
Unfortunately, this. That PC was a beast 6-7 years back, but if you look at the quality of home-produced digital video from that era, it gives a good example of what was workable on a PC like that - i.e., not all that impressive (with some notable exceptions, obviously).
And whatever nVidia tech told you the 9500 was suitable for full HD decoding was an incredible optimist. For a short time I used a 9600GT (a much more powerful card) in an HTPC, and it still occasionally had issues with high bitrate full-HD content. Running the high screen resolution you are on the 9500 isn't helping your performance any either - that card is from an era when the average person was running 1024x768 17" screens, and although spec-wise it can drive large displays, it was never really intended for that.
Any video editing software you use will not offer satisfactory performance working with full HD on that machine.
That being said, if you need any advice on an upgrade or replacement path, feel free to ask. You can build a suitable machine on a shoestring budget these days.
Nanoxia Deep Silence 1 case | Ultra X4 850W PSU | Asrock Fatal1ty Killer 990FX | AMD FX8320@4.7gHz | Coolermaster Nepton 240m | 2x HIS R9 290 GPUs | 24gb G.Skill Ripjaws 1600mHz DDR3 | OCZ ARC 100 480gb SSD | Various WD Black and Seagate drives to the tune of ~20tb | I have been building systems for over 16 years, however my opinions can be and sometimes are incorrect. Please, call me out if I say something asinine.