start up your PC.
open the task manager and kill the following processes:
wdfmgr.exe
alg.exe
svchost.exe with the largest amount of memoryuse - a system one.
mdm.exe
all Antivirus programs
realsched.exe if you have real player
quicktime tasks
clear your autostart folder
switch off ALL of the autoupdate services - its enough to do windows update manual once a month
specially mdm (machine debug manager)
and wdfmgr will cause ryzom to crash - i dont know why, but its a fact

Try - but on some systems it will have no effect ;(
Mine got boostet!!
Athlon 2200+@2600+
Gfx 5600XT@5700
768MB Ram 333
Win XP SP2