I don't know if they're hardware install files..... it's kind of the whole reason I posted my question. I don't know what they are. The files have a random assortment of letters and numbers followed by either *.msp or *.msi
And I'm not about to copy all those files to a cd. If they're important, then they need to stay there. If not, I'm not going to try to keep track of them on a cd.
Also, a correction. The path is C:\Windows\inf\Installer\, not C:\Windows\Installer.