Guild Wars 2

Hi,
I recently installed windows 8.1 and i noticed that my game keeps crashing after a while.
I tried going on cmd and doing the repair thing multiple times.

Is there a particular reason why it’s doing this?
Here are the last error messages :

—> Error Logs <—
ding ‘0’ texture failed
Mem Arena ‘Transient’ capacity exceeded. Attempted alloc category: ‘Uncategorized’ Size: 49960
Map load hang on STATE_MODELS_STREAM detected: MapId: -1, Position: (33544.699219, -33231.199219, -1740.130005), Completion: 0.000000
Texture missing mip chain: 0×00e689
TRY_ALLOC failure on arena(Character) category(Composite Packfile) size(65460) whiteBox(false). Evicting unused model files and attempting again
Model ‘0×00df13’: LightningSetActionPoints: destination action point ‘fxwristr’ not found on model ‘0×082239’
Model ‘0×00df13’: LightningSetActionPoints: destination action point ‘fxwristl’ not found on model ‘0×082239’
Mem Arena ‘Character’ capacity exceeded. Attempted alloc category: ‘Composite Packfile’ Size: 127044
TRY_ALLOC failure on arena(Character) category(Character Packfile) size(17624) whiteBox(false). Evicting unused model files and attempting again
Texture missing mip chain: 0×09a02a
Material ‘0×034fc5’ is missing textures.
Material ‘0×034fc5’ is missing textures.
Material ‘0×034fc5’ is missing textures.
Material ‘0×034fc5’ is missing textures.
TRY_ALLOC failure on arena(Character) category(Composite Packfile) size(79176) whiteBox(false). Evicting unused model files and attempting again
TRY_ALLOC failure on arena(Character) category(Character Packfile) size(29252) whiteBox(false). Evicting unused model files and attempting again
TRY_ALLOC failure on arena(Character) category(Character Packfile) size(33224) whiteBox(false). Evicting unused model files and attempting again
TRY_ALLOC failure on arena(Character) category(Character Packfile) size(136232) whiteBox(false). Evicting unused model files and attempting again
Model ‘0×00df13’: LightningSetActionPoints: destination action point ‘fxwristr’ not found on model ‘0×082239’
Model ‘0×00df13’: LightningSetActionPoints: destination action point ‘fxwristl’ not found on model ‘0×082239’
Texture missing mip chain: 0×09a02a
Mem Arena ‘Default’ capacity exceeded. Attempted alloc category: ‘Gr Img’ Size: 8389088

—> DirectX Device Info <—
VendorId = 0×10de
DeviceId = 0×1200
Version = 9.18.0013.3182
Description = NVIDIA GeForce GTX 560 Ti
Compat = 0×00100000
VidMem = 2745 MB