Not enough memory for windows Aero?

[Xire]

Hi, ive recieved the message twice now whilst playing wow...I find it hard to believe my PC is struggling to run it. Never had this issue with my old computer. Any idea why I keep recieving this message? is it false? am I ok to just ignore it (ive checked my memory usage and its never been above 30%-50%)? Spec:

Overclocked Intel® Core™i5-2500k Quad Core 4.60GHz
ASUS® P8P67 PRO
8GB KINGSTON HYPER-X GENESIS DUAL-DDR3 1600MHz
Geforce 480GTX SE
OCZ Vertex 2E 60GB
2TB WD CAVIAR BLACK
CORSAIR 850W TX SERIES

Cheers!

 

[Xire]

exactly what I thought >_>

 

[Xire]

I have windows 64 bit and just ran the windows exPerience. I told it not to tell me again as it's quite obvious my pc is more than capable. Thx guys