"Boot Manager is missing, press Crtl-Alt-Delete to restart."

Hello,
 
I had been having crash problems and slow boot ups so I decided to change the settings in Registry Editor, I modifyed the wrong number code.
Therefore when I tried to reboot it caused by Windows not being able to boot up.
A second later a blue screen popped
up for a second and gave me an option to Startup Repair and Reboot.
When I used Startup Repair it DID NOT fix my problem.
I did this around 8 times.
I also did a system restore to the earliest date possible, still DID NOT work. After multiple tries I tried
to use AlienwareRepawn program to back up my files, and that DID NOT work, actually made it worst so I decided to leave it alone.
When I turned on the computer the next day...
"Boot Manager is missing, press Crtl-Alt-Delt to restart".
 
Thank you very much, please help.
 
Information:
 
Alienware Aurora
Intel® Core™ i7-2600K (8MB Cache) Overclocked Turbo Boost to 4.1GHz
Genuine Windows® 7 Ultimate, 64Bit, English
8GB Dual Channel DDR3 at 1600MHz
Dual 1.5GB NVIDIA® GeForce® GTS 450 - SLI® Enabled
1TB SATA 3Gb/s (7,200RPM) 32MB Cache
Single Drive: 24X CD/DVD burner (DVD+/-RW) w/double layer write

Solutions to the Problem "Boot Manager is missing, press Crtl-Alt-Delete to restart."

If you have Windows DVD or installation, you could run repair from it, for more detail visit:
http://windows.microsoft.com/en-us/windows7/products/features/startup-repair

Click here to download the registry repair application

Another Safe way to Fix the problem: "Boot Manager is missing, press Crtl-Alt-Delete to restart.":

Click here to download the registry repair application .

How to Fix "Boot Manager is missing, press Crtl-Alt-Delete to restart." with SmartPCFixer?

1. You can Download SmartPCFixer here. Install it on your computer. When you open SmartPCFixer, it will perform a scan.

2. After the scan is finished, you can see the errors and problems which need to be fixed.

3. The Repair part is done, the speed of your computer will be much higher than before and the errors have been removed. You can also use other functions in SmartPCFixer. Like dll downloading, windows updating and print spooler error repair.

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