knockout

hey, guys, first of all, many thanks to nuhi. Days ago, after removing some components of my vista_business, I tried to install it from harddisk using winpe, before installation starts, a error message popup stating a required CD/DVD driver is missing and prompt me to install it from a flopy disk or local harddrive even i drag DVD-ROM out of my laptop, this message still appears. Did any quys meet this problem?