I have purchased the new pavilion a1520y and under that I have installed the windows XP pro on mine system. Everything on system works fine except SM Bus Controller. I have installed the SM Bus Controller driver on mine system and whenever I go to the device manger SM Bus Controller shows yellow exclamation mark in the Device Manager. I donít why this happening, I have tried to solve this issue by searching on the other threads but I didnít have any information. Can anyone suggest on this issue and so that I can solve this issue.