Go to
ASUS website, select W7 - 64bit, & try the driver under Chipset:
Intel INF Update Driver
2.32 MBytes update 2010/01/25
If that isn't it then try the first two under OTHER.
Try Intel(R)_Management_Engine_Interface first from this list
and if not that then try Intel Rapid Storage Technology driver
If it is not one of those three then report back here and I'll look for other possibilities