At the moment, there are a couple options
1) Manually revert all of the changed file, which is possible (backups are mode of most of them) but would require reading the source code (there are a couple of files that are change, I don't know them off the top of my head).
2) Restore the dvd
3) Install on your desktop as it is. NBI is designed for netbooks, but I use it on desktops all the time too.
Anyways, NetbookBootMaker will no longer change any files on the dvd, so it'll be easy to revert in the future (plus, it's less likely to have issues when upgrading an install disk from one version to another).