Well the best thing you can do for your problem right now is revert to the 1.28 patch - if you do not play online, that is.
There have been various attempts at fixes to the memory problem but no solutions found really. The XP bug...well I don't know if Bioware are ever going to address it, it's been around for a long time and comes about only on XP (this may sound familiar to you) where the screen freezes, your character and everything else stops responding and the sound/music begins to loop, over and over (sometimes at night I still hear that same, haunting loop in my head

).
The problems with the memory leak really started with this lastest patch 1.29, and if you are still playing the official NWN's module just don't update until 1.30 comes out (in about 2 weeks).
[ 04-23-2003, 02:51 PM: Message edited by: SpiritWarrior ]