Make sure, you've got recent intel drivers, that should be version 2.17 (2.18). http://www.guildwarsguru.com/forum/intel-graphics-cardi-t10407516.html recommends to run Guild Wars with command line options "-dx8 -noshaders". also see http://appdb.winehq.org/objectManager.php?sClass=version&iId=9194
