decrease quality to play on older computer?

[Johanovitch]

Do you mean that I should uninstall divx and only install ffdshow (now they both are installed)

Also, In bsplayer, I set postprocessing to the lowest value; in ffdshow, postprocessing isn't checked. should I check it and then set it to the lowest value, or is postprocessing completly disabled if it isn't checked?

I'll try if updating my sis driver helps, but I doubt it, it's just a bad mainboard with an onboard videocard which has shared memory...
I know other computers, with oly a 366MHz cpu, wwith a decent videocard and it works just fine on those comuters.

Thanks for the tips already, I'll let you know if it helps!