You have a old computer, without any hardware acceleration for video playback probably - as the codecs in use today is not supported by 10-15 year old hardware. Get a new computer to play 1080p. Note that modern computers has hardware support, so even mediocre computers, like Raspberry Pi, will perform better.
There is simply no way to make modern video function in a good way on such an ancient system. It lacks hardware support (in GPU) for H264 codecs, and it does not have enough CPU power to play back in software.
It is theoretically possible to transcode it to some less demanding codec, that can be played back, but this is likely to be more hassle than to get for instance a RPi to play the video...