Kin-an na nako sa internet.
http://ubuntuforums.org/showthread.php?t=145103
Follow this nalang.
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Boot with the XP installation CD.
When prompted, press R to repair a Windows XP installation.
If repairing a host with multiple operating systems, select the appropriate one (XP) from the menu. If you have only one operating system, enter 1 to select it.
Enter the administrator password if prompted.
To fix the MBR, use the following command:
Type y and ENTER to fix the MBR.
Type exit to leave the recovery console and reboot.