Hi again,
my pc works with vista and Archlord runs smoothly
no lags, no stupid deads
so changing to windows xp is overreacted and if u don't have the windows xp installation cd's it will cost ya a lot of money.
So here is my suggestion:
1) turn ur theme to windows classic
2) Set the in-game graphics to a minimum (the graphics will
still be ok, but of course it's not HD
)
3) download the latest version of Direct X, for example
from here:
If this still doesn't work u can try to enlarge ur virtual memory (u can acces it through system/ advanced options). This is basically everything u can do to reduce the lag without upgrading ur computer with new hardware like graphic cards and more memory.
I hope this will work for u.
Greetz