Here is a tutorial how to fix it. Try it hopefully you will get what you want.
UPDATE AS Comment says
1: Insert your bootable media whatever you have like Windows 7 DVD or USB.
2: Boot from the bootable disc or USB.
3: Instead of click on
Install Now select the option given bellow on dialog box
4: Select the Startup Repair option.
5: Now click on Startup Repair. Run the startup repair and it will attempt to fix this issue.
If it doesn't work, follow step 6.
6: Click on Command Prompt.
A) Type c: and press
C:\ is the drive letter where Windows 7 is installed. You may replace it with whatever drive letter you want where you have installed Windows 7.
B) At the C:\ prompt, type cd boot and press
C) At the C:\Boot prompt, type the following commands and press Enter after each command.
Now close the command prompt, remove the DVD and reboot your computer.Best of luck.