Boot from your Win 7 DVD into a command prompt.
Can you see the disk and drives there?
COMMAND PROMPT - GO TO A COMMAND PROMPT USING YOUR WIN 7 DVD
■Boot up from your Windows 7 DVD.
■At the first dialog window, press
SHIFT + F10 key combo
■You will have a
X:> command prompt
X: is a ram drive created by Windows 7.