Smushes -
that is an aura, not a weapon particle effect. Unfortunately with the donor aura on the underfoot client, the player who has the aura has to turn it off himself (by going to the donor aura NPC in the hidden vale) for the graphic to go away. The good news is, I can tell by the pictures you uploaded that the weapon particle effects are in fact off on your computer. Maybe complain to the player about their aura, or get a computer that can handle later EQ graphics a little better
Noren -
you have to zone after turning the player particle density off for the changes to take effect. I am using the underfoot client, and here is what the weapon particles on the cleric, berserker and bard donor look like before and after zoning, after having turned the particle effects off: