use Boot disk when the computer is start up,it show
A:
THEN press
C:
SHOW
A:\C:
THEN SHOW
C:
THEN PRESS cd windows
SHOW
C:\cd windows
THEN SHOW
C:\WINDOWS
THEN PRESS
winnt
SHOW
C:\WINDOWS\WINNT
THEN IT WILL RE-INSTALL THE WINDOWS
你要抄回prodout key for RE-INSTALL THE WINDOWS