HELP me in DOS mode at C Prompt Copy my complete Windows CD to C:\install

I have a Removeable C: hard drive on my computer. Now I have 3 drives that I can replace it with. I have Windows98 on one, now I want to have Windows 2000 Pro on #2 and Windows XP Home on #3.
....
In Dos mode at C:\>, I forgot how to Copy the complete Windows CD and the sub-directories from my CD-rom drive (D:\) to my C:\install directory. In this way I can install the opertion system from the hard drive. Now any time I want to install something new and it ask to insert the CD, I won't have to, it will go to C:\install directory instead.
.... Help Me Please .... Thanks

The two commands are:

   md c:\install
   xcopy d:\*.* c:\install /s /e

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