Anyway to play Full HD videos on my old PC smoothly?

I have Pentium 4 PC with an ATI Radeon 7000 Display card, and when I play full HD videos on it, they are not watchable.. they are slow and and the picture pauses every few seconds. although 720p videos run pretty good. I play all of them using MP classic. and I tried several filters like cyberlink and nVidia, and... show more I have Pentium 4 PC with an ATI Radeon 7000 Display card, and when I play full HD videos on it, they are not watchable.. they are slow and and the picture pauses every few seconds. although 720p videos run pretty good. I play all of them using MP classic. and I tried several filters like cyberlink and nVidia, and the result is the same.

Is there is anyway to play 1080 videos smoothly on this PC? l
Update: I mean without changing in hardware
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