I have the same issue, and stupidly I did the same change, I can not boot from CD, I already tried, the same message appears, any suggestions?
I have recently bought an Inspiron 14 x64 based Laptop with Windows 7 64 bit OS (OEM) and receive this msg "BootMgr is Missing."  1. It was fine at a start, but I allot my partition badly C:drive is only 30GB and Logical drives is 182GB, so I wanted an increase of C: 2. Thru  a web forum I learn about "Partition Wizard Home Edition" downloaded it and use it to come up with a better partition. It was an easy success, quickly my C:drive increased with my desired size. But it was just a short relief for I noticed that my IE 8, YM, Windows Media Player, Mc Afee Security Center and others are not running properly or doesn't run anymore.  3. I resorted to a RESET to Factory Settings thru a DELL Local Back-up that comes with my unit. It did pretty good. All was just like the way it was. (I dont have to worry about my files coz I have an external modem to transfer everything)  4. Normal function is there for an hour, but to my curiosity I check on disk management and found out RECOVERY DRIVE is the one Active compared to C:Drive before.  I then Mark C:Drive as ACTIVE without knowing my OS doesn't seat there anymore (just I thought). 5. When I restart, there I got BOOTMGR is missing press CTRL+ALT+DEL.  6. And my problem is still not resolved, I tried to use a Repair Disk which I burned earlier but it did not work as well even if I choose boot from CD/DVD on boot options. 7. What could be my best solution? My package did not come with a Windows 7 DVD Re-installation Disk. My room mate has an Inspiron 1545 with Re-installation Disk. Can I use that to reboot? I am afraid it might add up another problem because it is from a different model and configuration.  Pls. extend your help for me to be able to reboot and use my new laptop once again. Can I download the Reinstallation Disk for my Inspiron 14 so I can have it finally? I have the service tag and necessary product code that comes with it.   
BootMgr is Missing in Dell Inspiron 14 / Windows 7