Fernando, I install successfully XP SP3 on asus K40IN (chipset's NVIDIA MCP75L) with compatibility mode in BIOS (using nLite to intergrate driver) and then, I try to change compatibility mode to enhance mode but unsuccessfull. please tell me how to change to enhance mode or install XP in enhance mode?! thank you. sorry for my english. detail for asus K40in: http://www.asus.com/product.aspx?P_ID=VB4TfUFszKKyzdR1