I was getting a yellow mark in device manager for "pci simple communication controlle". MoBo was ASUS P7H55-M LX os win 7 ult. Once again looked in the manufacturer's supplied Driver CD. got it . it was something to do with Intel storage manager or such thing, don't remember it as i donot have the cd now. will post the right solution when i get my hand on it the next time. Thanks all for trying to help