bootmgr missing press ctrl+alt+del to restart?

I was working on a project for class on my v.m. vista business. had to rename bootmgr, which i did. now i get a message bootmgr missing. which was good that was saposed to happen. now i can seem to fix it can't find how to fix it in my darn book. please help!

Welcome.

If you're all done with the lesson, then just run a system restore.

Welcome
Restore may not work with your problem, but does not hurt to give it a try.
If it does not:
http://www.vistax64.com/tutorials/204930-bootmgr-missing.html