Animations not working (Storm Bow, Spirits etc)

Ive been having a problems with animations not working. After Ive been playing for a while, the animations stop working. The animations on the Storm Bow, Spirits in the river in Nightfallen Jahai, Spirits in the bridge in Abbadons Gate & the Spirits in the bridge in The Gate of Fear (I think its the gate of fear). I noticed this happening after NF came out, the other 2 campaigns dont have areas like this. Im not blaming the game, its more than likely my PC.

My specs are:
Abit AN8 Ultra
AMD 64 3700+ (Slight O.C. to 2.4)
1 GB Corsais XMS 3200 Pro
ATI X800XL AIW
OCZ GameXStream OCZ600GXSSLI Power Supply

Anyone know what could be causing this? Or even better, how to correct it?

Thanks in advance

There have been some animated weapons issues reported in the past, this might be due to some corruption of your Gw.dat file. There was information a while ago on guildwiki stating that after a few hours of playing GW some of the animations stopped, can't seem to find it anymore so it may have been fixed. Still hope this helps.