Manual Zone

      Installing Ubuntu may make you crazy sometimes.  If you have a new model of computer, drivers of it probably cant be find. Even though you installed Ubuntu by trying several times and when you shutdown the computer,it may not properly shutdown. Then you press the POWER BUTTON half inch more down than it can be normally press. Again you restart your computer, then you realize that you couldnt able to login to neither Windows or Ubuntu. Oops, wait.... Dont hit to your computer. That isnt an error of hardware. Also, dont take Windows dvd and start installing operating systems.
( It is recommended to install Windows first. Because Windows dont care about other operating system. So, you have to install Windows first. Then install Ubuntu which care about other operating systems. )
Here are some simple steps to "how to recover your windows bootloader". After you recovered Windows bootloader, it will enable you to login to Windows OS.

Put Windows OS dvd into your ROM and restart computer.
( when you are in BIOS mode, press Alt+Ctrl+del to Restart computer. )

After few minutes, Windows will be loaded and it shows language page. Press "Next" button and go to next menu.

In this page, there is a button called "Install". Below that button, there are two links and click the link "Repair your computer".

In this page,there is a option as "Repair start-up". You can try it and restart your computer.(But many of time it isnt working.)
Or select "command prompt" and follow below commands :

• >diskpart

• >select disk 0

• >list volume   (make a note on what is the assign letter for CD-ROM. My one is  G )
  

• >exit

• >G:

• >cd boot

• >dir      (this command will list down the files which are inside boot folder. "boot" is a folder which is on Windows DVD.)

• >bootsect /nt60 SYS /mbr

• >exit

Then close command prompt and restart your computer. You can login to the Windows now. I guarantee it.