blackmac said:autoexec might be too late, but it's worth a try. Question is: How does the script recognize if you are in Bootcamp or Parallels?
I do not know the technique - did once, but that was years ago.
The BAT file can be setup like the Boot.INI file where it waits for you to make a selection or to time out to the default.
One selection would copy the files for Boot Camp to system32, the other selection would copy the files for Parallels to system32.
I am not sure what has changed in the load order since early Win95, but I'm betting it would work.
The worse that can happen is you get the activation screen!
ajm