what operating system?
insert your windows cd and open a MS-DOS command prompt.
navigate to your cd drive (in my case D) by typing D: and then enter.
Then copy and paste the following command:
Extract /a win98_21.cab rundll32.exe /l c:\Windows
If you have a i386 folder under windows
Extract /c:\windows\i386 rundll32.exe /l c/:windows\system32