I appreciate your help, but I am not trying to create a CD solution. I am actually using hard drive images sealed with Sysprep. However, your idea to insert a "dummy" boot loader, execute the needed scripts, and then hand the system over to Windows sounds like what I will need to do.
Now, my only issue there is that I need (want) a solution where I won't need separate partitions. Is there any way to get a DOS environment running from an NTFS partition without damaging the pre-existing Windows installation?
The theoretical situation I have in my head sees it like this: Install environment that will let me run .bat and .exe files. Reseal system. First boot up, DOS runs my scripts. Hand system over to Windows/mini-setup. At end up mini-setup, remove traces of alternate environment.
Which is why I need it to run off the same partition, you see. I can't really just have a useless partition (well, useless as far as out customers are concerned) just sitting there, and I really don't want to have to deal with adding re-partitioning sequences into the setup.
I tried looking all this up online, but didn't find anything promising so far. Thanks again for all the help guys!