Fix..Boot Loader Missing.?

Boot loader missing?

Why Boot Loader Missing Error Occur In my pc?
1.Due to Malware and Trojan Activity in Your Pc leads to Destroy System Files and Corrupt the Main User Systems File
2.Due to Improper Shutdown and Restart of Your Pc Due to
3.No update of Drivers and No installation of Hardware Peripheral of Computer and no installation of Windows Drivers.
Solution for XP
>-->Insert Your OS xp disc Then repair option in main menu
>-->In cmd Type FIXBOOT C: then FIXMBR Now it is fix
For win 7 or vista
>-->Insert os dvd
boot option(press f8) or simply boot
>-->Click on startup repair
>-->Wait until it completes

It will fix