I reinstall windows. Then I regret that and want to go back.

Fortunately the old windows is stored at windows.old

I follow the instruction in

http://support.microsoft.com/kb/971760

I did it all with small catches

When I insert the windows 7 installer, the drive for installer is X and my hard disk is D rather than C. However, on normal windows operation the drive is C. Only when I boot through CD the partition is assigned to the letter D.

There is no file bootsect on my windows installer

So I can't do

**D:\boot\bootsect /nt60 c:**

Which should be changed to X:\boot\bootsect /nt60 C: or X:\boot\bootsect /nt60 D: depending on what it really does. As I said if I boot through windows dvd my hard disk letter is D but normally it's C.

I am not even sure what that bootsect does anyway.

I also can't do this one

Attrib –h –s –r boot.ini.saved Copy boot.ini.saved boot.ini

There is no file boot.ini or boot.ini.saved

It's hidden but I don't see it if I try to look unhidden files either.

Because I simply switch from windows 7 to windows 7 and the directory for windows don't change c:\windows I thought it should still work.

Well, it doesn't. When windows restart it only goes to the logo and then restart the computer.